KR20020075134A - Method and system for cooperative buying - Google Patents

Abstract

PURPOSE: A method and device for a group buying is provided to enhance a participating rate of a group buying by distributing a profit generated by a group buying differently according to purchase commodities of buyers through a lottery. CONSTITUTION: If a service provider connects to a central control device(61) and inputs selling commodity information and different discount rate information with respect to each purchase commodity of at least one buyers(62), the central control device embodies a group buying number with respect to a commodity inputted by the service provider, and a group buying is started(63). At least one buyer connects to the central control device using a buyer modem of a buyer interface(64). If the buyer searches a group buying commodity(65), the central control device transmits selling information of the commodity and a different discount rate information according to the number of commodities of buyers to the buyer(66). The buyer inputs purchase information with respect to the group buying commodity to the central control device(67). If a pre-set group buying group buying time is reached or all commodities are sold, the group buying is terminated(68). The central control device decides a discount rate to be applied in each purchase commodity of buyers through a lottery(69). The central control device informs group buying contract conclusion information(70). The buyer pays a commodity price to the central control device as a discounted price(71). A seller delivers the commodity(72).

Description

Method and system for cooperative buying

The present invention relates to a method of making a joint purchase using a differential discount rate. More specifically, the present invention relates to a method of joint purchase using a computer to apply a differential discount rate from 0% to 100% for each purchase product of each purchaser for each of the two or more purchasers.

The conventional joint purchase method is a sales method that uniformly compensates the buyers for the reduced part of the production cost by varying the discount rate according to the number of purchase products of a plurality of buyers. As a result, buyers do not receive significant discounts, resulting in low participation rates.

In order to solve the above problems, an object of the present invention is to increase the participation in joint purchase by differentially distributing the profits of the joint purchase for each purchase product of the buyer through a lottery.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a schematic configuration of an apparatus for executing a joint purchase method for lottery determination of a product discount rate using a computer according to the present invention.

FIG. 2 is a diagram showing the configuration of the central controller 30 in the apparatus shown in FIG.

3 is a flowchart illustrating a joint purchase method according to an embodiment of the present invention.

4 is a flowchart illustrating a joint purchase method according to another embodiment of the present invention.

5 is a product discount rate lottery method according to an embodiment of the present invention

6 is a product discount rate lottery method according to another embodiment of the present invention

Explanation of symbols on the main parts of the drawings

11, 13: buyer interface

12, 14: Buyer Modem

15, 17: Merchant Interface

16, 18: Merchant Modem

30: central control unit

31: central processing unit

32: RAM

33: Product Search Engine

34: Roman

35: watch

36: operating device

37: network interface

38: data storage

39: Buyer Database

40: Merchant database

41: buyer account

42: Joint Purchase Progress Database

43: Payment Database

In order to achieve the above object of the present invention, a method of performing joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchased product of each buyer for each total number of purchases of two or more buyers Transmitting, to the buyer, the product information and the differential discount rate information of 0% to 100% of at least two kinds of each purchase product of the buyers for each total number of purchase products of each of the two or more buyers; Requesting a purchase, paying the price of the goods by the buyer, closing the joint purchase, determining a discount rate to be applied to the goods purchased by the buyer, and drawing the winnings to the buyer. It provides a joint purchase method comprising the step of refunding or saving the equivalent of the discount rate to the buyer account.

According to another aspect of the present invention, in the method of performing joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchase product of each buyer by the total number of purchases of each two or more buyers, Transmitting, to the buyer, the product information and the differential discount rate information of 0% to 100% of at least two kinds of each purchase product of the buyers for each total number of purchase products of each of the two or more buyers; Requesting, closing a joint purchase, determining a discount rate to be applied to the product purchased by the buyer, and paying the buyer a sum of the normal price of the product minus the winning discount amount. It provides a joint purchase method characterized in that it comprises a step.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

1 is an apparatus for executing a joint purchase method using a computer according to the present invention to apply a differential discount rate of 0% to 100% for each purchase product of each purchaser for each total purchases of two or more buyers. It is a figure which shows schematic structure.

Referring to FIG. 1, the apparatus according to the present invention is composed of a seller interface 15, 17, a central controller 30, and a purchaser interface 11, 13 (overall nodes). Each node is connected through an internet connection using a public switched telephone network. Such connections may be made by leased lines, cellular personal communication systems, or satellite broadcasting networks. The purchaser interfaces 11 and 13 and the seller interfaces 15 and 17 are input / output gates that communicate with the central controller 30.

Using this configuration, the present invention provides a method and apparatus for making a joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchase product of each buyer by the total number of purchases of two or more buyers. to provide.

As shown in FIG. 2, the central control unit 30 includes a central processing unit 31, a RAM 32, a product search engine 33, a ROM 34, a clock 35, an operating device 36, and a network interface ( 37), and a data storage device 38.

A traditional personal computer or workstation with a significant amount of memory and processing power can be used as the central controller 30.

In one embodiment it acts as a web server to send and receive the buyer's purchase information and buyer information and the seller's sales information and seller information. The central control unit 30 can perform a large amount of work by executing a huge amount of mathematical calculations in information processing or database search. A Pentium microprocessor, mainly produced by Intel Corporation, may be used as the CPU 31.

The data storage device 38 may comprise a hard disk which is magnetic or optical storage devices.

The data storage 38 includes a buyer database 39, a seller database 40, a buyer account 41, a joint purchase progress database 42, and a payment database 43.

In a preferred embodiment, database software such as Oracle7 produced by Oracle Corporation is used to create and manipulate these databases.

The buyer database 39 stores information related to the buyer, such as member name, ID, authentication information, address, telephone number, social security number, social security number, business registration number, e-mail address, past device use, products of interest to purchase, etc. do.

The seller database 40 includes information related to the seller such as a member name, ID, authentication information, address, phone number, social security number, social security number, business registration number, e-mail address, credit history, past device use, merchandise sold, etc. Save it.

The buyer account 41 stores the information related to the cyber money or mileage of the amount of the discount which the buyer obtained from the joint purchase.

The joint purchase progress data base 42 includes a joint purchase number, seller's sales information, differential discount rate information from 0% to 100% of at least two types of each purchase product of each buyer, for each total number of purchases of two or more buyers, Purchase information, buyer information, and seller information are stored.

The payment database 43 stores payment information such as a buyer's bank name, a bank account number, a credit card number, a credit card transaction approval number, a seller's bank name and a bank account number.

The network interface 37 is a gateway for buyers and sellers to exchange information through the respective buyer interfaces 11 and 13 and the seller interfaces 15 and 17. The network interface 38 is connected to the Internet.

The purchaser interfaces 11 and 13 and the seller interface 15 and 17 can be traditional personal computers, PDAs or mobile phones.

Although the present invention focuses on the merchandise trade contract, the present invention naturally includes a service provision contract (delegation contract, lease contract, lease contract, etc.).

For example, passenger transport contracts, hotel accommodation contracts, rental car contracts, medical contracts, etc. are also included in the present invention.

In embodiments of the present invention, the central control unit 30 serves as a web server, and communication software such as Microsoft's Internet Explorer web browser may be used. Buyers and sellers other than the Service Provider will use Internet Explorer to transmit sales information, seller information, discount rates, purchase information, and buyer information.

FIG. 3 illustrates a method of performing joint purchase by applying a differential discount rate from 0% to 100% for each purchase product of each purchaser by using the computer according to one embodiment of the present invention. One Flowchart The method according to the embodiment of the present invention is performed by the apparatus 30 shown in FIG.

If the service provider is a seller or if the service provider represents or acts on behalf of a seller other than the service provider:

The service provider connects to the central control unit (61), and the differential discount rate of 0% to 100% of at least two types of each purchase product of the buyers for each sale product information and the total number of purchase products of each of the two or more buyers. Upon entering the information (62), the central control unit 30 displays the sale product information and the differential discount rate information of 0% to 100% of at least two types of each purchase product of the buyers for each total number of purchase products of each of the two or more buyers. The joint purchase progress database 42 is stored. Herein, the selling product information is information of at least one of the product information that can identify the product, such as the product name and model name to be sold, and the normal price of the product. It may also include sales information of the product, such as the deadline for participation in the purchase, the delivery destination and the payment means.

For each total number of purchases of two or more buyers, the differential discount rate information of 0% to 100% of at least two types of each purchaser of each purchaser indicates, for example, the number of purchases subject to the differential discount rate if the number of purchases of the buyers is 100. If the information is 0% 10, 5% 40, 10% 20, 30% 10, 40% 10, 100% 10, and the number of buyers is 200, then the number of discounted items is 0% 10 , 5% 70, 10% 40, 30% 30, 40% 30, 100% 20.

According to an embodiment, when a discount rate of each product according to the number of purchasers of the purchaser is input to the central control unit 30, the central control unit 30 purchases the purchasers according to the differential discount setting criteria previously input by the service provider. You can also set the differential discount rate for each product based on the number of products. For example, if the service provider inputs 120% of the purchases of the buyers, the discount rate of each product is 30%, and 200% of the purchases is 40%. , 10% 20, 30% 40, 50% 20, 100% 12 can be set, and 200 can be set to 0% 50, 40% 100, 80% 50.

The central control unit 30 then assigns the joint purchase number to the product entered by the service provider and starts the joint purchase (63).

The central control unit 30 stores the joint purchase number and information indicating that the joint purchase of the product input by the service provider has been started in the joint purchase progress database 42.

In another embodiment, a case other than the service provider is a seller and the person sells directly through the service as follows.

Referring to FIG. 3, first, the seller connects to the central control device 30 using the seller modems 16, 18 of the seller interface 15, 17 in step 61.

The seller then enters the sales information into the central controller 30. The seller inputs at least one piece of information of the product, such as a product name and a model name, to be sold, and the normal price of the product. According to an embodiment, sales information of a product such as a quantity of a product, a deadline for participating in a joint purchase, a deliverable location, and a payment settlement means may be input. The deadline for participating in the joint purchase may be arbitrarily designated by the seller. The seller may select one of the selected deadlines entered by the central control unit 30 and input the selected one. It may be set automatically by 30. In addition, depending on the embodiment, without a seller's deadline designation, it is possible to select a configuration that automatically participates in the joint purchase when a predetermined period, for example, one day has elapsed from the joint purchase application date.

The seller then provides the central control device 30 with sales information whose components are the discount rate of each product according to the number of purchased goods of the buyers or the differential discount rate of two or more kinds of each product according to the number of buyers of the goods. Enter it. When the seller inputs a discount rate of each product according to the number of buyers 'purchases without inputting a differential discount rate of each product according to the number of buyers' purchases, the central control unit 30 determines the number of purchases of the buyers. Set a differential discount rate for each purchased product.

The seller then sends at least one piece of information to the central control unit 30 that identifies the seller, such as the seller's name, ID, password, social security number, social security number, business registration number, phone number, and email address. Enter it. In this case, if the seller is not a member, the membership information may be entered and then the membership registration process may be performed. The member information input by the seller may include a member's name, address, bank account number, social security number, social security number, business registration number, products sold, and the like. Member information entered by the seller is stored in the seller database 40 of the central control device (30).

The central control unit 30 stores the sale product information and the differential discount rate and seller information of each product according to the number of purchase products of the buyer in the joint purchase progress database 42.

The central control unit 30 then assigns a joint purchase number to the merchandise entered by the seller and starts the joint purchase.

The central control unit 30 stores the joint purchase number and information indicating that the joint purchase for the product input by the seller has been started in the joint purchase progress database 42.

In the next step 64 at least one shopper connects to the central control unit 30 using the shopper modems 12 and 14 of the shopper interfaces 11 and 13.

According to the embodiment, when the purchaser proceeds with the joint purchase for the goods of interest registered in the central control device 30 as the goods of interest at the time of membership registration, the central control device 30 provides the buyer with the sales information of the goods and When the differential discount rate information of each product according to the number of the purchased goods is transmitted to the buyer through e-mail or SMS, the buyer may access the central controller 30. At this time, the seller information, the number of other buyers participating in the joint purchase and their information may not be transmitted or one or more of them may be transmitted.

When the buyer searches for the product in the joint purchase (65), the central control unit 30 transmits the sales information of the product in the joint purchase and the differential discount rate of each product according to the number of the purchased products of the buyer to the buyer (66). ). According to an embodiment, the product information on which the joint purchase is in progress may be provided to the buyer by category, and among the products on which the joint purchase is in progress, the product registered in the central control device 30 as a product of interest when the purchaser registers as a member. Only information may be provided to the buyer. This may not include the seller's information, the number of other buyers participating in the joint purchase and their information, or may include one or more of them.

In the next step 67, the buyer inputs the purchase information to the central control unit 30 for the commodity in progress. The purchase information is a product purchase request, product quantity, delivery date, destination, payment method, etc. during a joint purchase.

According to an exemplary embodiment, the purchaser may directly input purchase information on the product in which the joint purchase is in progress, without searching for the product in the joint purchase (67). For example, when a purchaser registers as a product of interest, if a product registered in the central control unit 30 is jointly purchased, the central control unit 30 notifies the buyer by e-mail. Since there are many ways to get information about the products you are purchasing, if a buyer obtains information about the products that are in the process of purchase, the buyer does not search for the products that are being purchased. This is because purchase information can be input for a product.

Then, the buyer inputs at least one piece of information of the buyer to identify the buyer, such as the buyer's name, ID, password, social security number, social security number, telephone number, etc. (67).

If the connected buyer is not a member, the member registration process can be performed by entering member information. At this time, the member information may include a member's name, address, bank account number, credit card number, social security number, social security number or business registration number, products of interest to purchase. The information entered by the buyer is stored in the buyer database 39 in the central control unit 30.

Next, the central control unit 30 stores the purchase information and the purchaser information input by the buyer in the joint purchase progress database 42.

When the predetermined deadline for purchasing a joint is reached or all products are sold, the joint purchasing is closed (68).

In step 69, the central control unit 30 determines the discount rate to be applied to each purchase product of the buyers by lot.

In one embodiment of the method it is possible to apply a high discount rate for the winning rankings by drawing the buyer's purchases.

In another embodiment, one of the discount rates of the two or more types of buyers may be drawn for each purchase product of the buyers, and a discount rate applied to each purchase product of the buyers may be applied.

At this time, in the lottery method, the central control device 30 may immediately draw a discount rate without the purchaser's participation. The method assigns a random number of the same or different range to each centralized discount rate belonging to a discount rate stage of two or more types of buyers, and then assigns the random number to the central controller 30.

A random number is generated by a built-in random number generating program, and a discount rate including the random number in the random number range may be determined by comparing the generated random number with the random number range assigned to the discount rate.

According to another embodiment, the purchaser's participation such as the archery type lottery method, the dart type lottery method, the roulette type lottery method, the pachinko type lottery method, the lottery type selection method and the scratch type lottery method, the lottery scratch type lottery method It is also possible to receive the central controller 30 draws.

Figure 6 is an example of the screen implemented the archery lottery method implemented by placing a discount rate in a target range to a certain range, and if you choose to turn the target (S10), the target is returned and if you select the archery (S11), the bow (S12) is shot in the target By hitting a certain discount rate, the discount rate is won.

7 is an example of a screen in which a scratch-type lottery method is implemented after selecting a lottery ticket. If one of the lottery tickets is selected (S20) and the selected lottery ticket (S20) is scraped with a mouse, the discount rate is displayed to win the discount rate.

At this time, the possibility of winning each discount rate is preferably equal.

For example, after assigning random numbers in the same range for each discount rate belonging to the discount rate stage to be drawn, one random number is generated by a random number generating program built in the central controller 30, and one random number generated above is generated. By comparing the random number range for each discount rate assigned, a discount rate including the random number in the random number range may be determined.

In the example of FIG. 5, when the target turning button S10 is pressed, one random number is generated and the bow is inserted into a discount rate S13 having the random number in the random number range.

6, one random number is generated when the lottery ticket S20 is selected, and a discount rate having the random number generated in the random number range appears when the selected lottery ticket S20 is scratched with a mouse.

In another embodiment, after assigning random numbers in the same range to each of the eight discount rates from 0% to 100% in FIG. 6, the discount rate having random numbers generated by generating random numbers is used as the discount rate of the first lottery, and then for the remaining discount rates. Repeat the same process to determine the discount rate of the first to the eighth lottery, select one of them and scrape with the mouse to display the discount rate of the lottery.

According to an embodiment, the possibility of winning each discount rate may be adjusted. That is, the possibility of winning a high discount rate to a buyer with a fast purchase order or a specific purchase order may be adjusted higher than that of other buyers.

The method assigns a weight to each discount rate belonging to the discount rate target to be drawn, and assigns a random number range to each discount rate in proportion to the weight, and then generates one random number by a random number generating program built in the central control device 30. By comparing the generated random number and the random number range of the individual assigned to each other can be determined to win the discount rate including the random number in the random number range.

In FIG. 6, weights are assigned according to eight types of discount rates from 0% to 100%, and a random number range is assigned for each discount rate in proportion to the weights. Scratch with a mouse to see the discount rate with the random number generated in the random range.

In FIG. 6, weights are assigned according to eight types of discount rates from 0% to 100%, and a random number range is assigned to each discount rate in proportion to the weights, and then a discount rate having random numbers generated by generating random numbers is used as the first lottery. You can set the discount rate, and then repeat the same process for the remaining discount rates, determine the discount rate for the first to eighth lotteries, and then select one of them and scrape it with the mouse to display the discount rate for the lottery.

According to an embodiment, after the central control unit 30 draws a discount rate in advance, an archery type lottery method, a dart type lottery method, a roulette type lottery method, a pachinko type lottery method, a lottery type selection, and a scratch type lottery If one or both of the seller and the purchaser determined as a party, such as a lottery scratching method, accept the participation, the discount rate can be shown to the lottery participants.

The central controller 30 stores the discount rate that is won for each purchase product of the buyer in the joint purchase progress database 40.

In step 70, the central control unit 30 provides the joint purchase contract establishment information, that is, the joint purchase number, the seller, the buyer, the discount rate, the sale information, etc. to the seller and the buyer, the seller, the buyer screen, and the email (E) of the joint purchase site. -mail) or SMS.

There are two ways to grant the buyer a substantial amount of discount, depending on the time of purchase.

First, after receiving the joint purchase establishment information in FIG. 3 (70), the buyer pays the central control device 30 by subtracting the discount amount from the normal price of the product (71).

For example, a credit card is as follows.

The purchaser selects a credit card as a payment method and transmits the payment data to the central controller 30. The central controller 30 then stores the credit card payment method selection and the payment data selected by the buyer in the joint purchase progress database 40. The central control unit 30 then finds the purchaser's credit card number in the joint purchase progress database 40 and sends it to the credit card company for approval. The credit card company then transfers the payment to the provider's bank account. The central control unit 30 then checks the remittance and stores the payment completion information in the payment database 43.

If the person other than the service provider is the seller, the credit card company remits the goods to the seller's bank account.

In another embodiment, if the credit card company transmits the authorization number to the central control unit 30, the central control unit 30 may transmit the authorization number to the seller.

In the case of wire transfer:

The buyer selects a bank transfer as a payment method and transmits the payment data to the central controller 30. The payment data may include the date of the scheduled transfer of the account, the name of the buyer's bank and its account number. The central control unit 30 stores the selection of the account transfer payment method and the payment data in the joint purchase progress database 40. The buyer then transfers the funds from his account to the provider's bank account. If the person other than the service provider is the seller, the central control unit 30 transfers the goods price to the seller's bank account.

Secondly, in the embodiment of FIG. 4, when the buyer inputs the purchase information and the buyer information to the central controller 30 and the buyer pays the central controller 30 (87), the discount rate is determined after applying the discount rate to each product. The control device 30 refunds the discount amount equivalent to the buyer or accumulates in the form of cyber money or mileage in the buyer account 41 (91).

For example, a credit card is as follows.

After the purchaser enters the purchase information and the purchaser information into the central controller 30, the buyer selects a credit card as a payment method, and transmits the payment data to the central controller 30. The central control unit 30 then stores the credit card payment method selected by the buyer and the payment data in the payment database 43. The central control unit 30 then finds the purchaser's credit card number in the payment database 43 and sends it to the credit card company to obtain an authorization number. The credit card company transmits the authorization number to the central control unit (30). The central control unit 30 stores the approval number in the payment database 43. After determining the product discount rate, the central control unit 30 transmits a request for canceling the partial approval of the amount corresponding to the discount rate and the approval number to the credit card company. The credit card company then remits the payment to the provider's bank account. If the person other than the service provider is the seller, the credit card company may transfer the goods to the seller's bank account. According to an embodiment, the central controller 30 may transmit the discount rate information and the approval number of each product to the seller. The central controller 30 stores the payment completion fact of the buyer in the payment database 43.

In another example, a wire transfer is as follows.

After the purchaser enters the purchase information and the purchaser information into the central control device 30, the buyer selects a bank transfer as a payment method and transmits the payment data to the central control device 30. The payment data may include the date the account is expected to be transferred, the name of the buyer's bank and its account number. The central controller 30 stores the payment method of the wire transfer payment and the payment data in the payment database 43. The buyer then transfers the sum of the normal price equivalent of the goods from his bank account to the bank account of the central controller 30. After the product discount rate is determined, the central control unit 30 transfers the amount of the product discount equivalent amount determined by drawing to the buyer's transaction bank account or accumulates in the form of cyber money or mileage in the buyer account 41. The central control unit 30 then stores the payment facts for the seller in the payment database 43.

Although the configuration of the present invention has been described above with reference to the preferred embodiments of the present invention, those skilled in the art will understand that various modifications can be made without departing from the spirit of the present invention. . Accordingly, the scope of the present invention encompasses all embodiments included in the scope of the technical spirit of the invention described herein, and is determined by the appended claims.

According to the present invention, by differentially distributing the profits obtained from the joint purchase for each purchase product of the buyer to increase the buyer's participation in the joint purchase to activate the e-commerce.

In other words, the joint purchasers are guaranteed the joint purchase price at least below the market price of the joint purchasers, and the regular buyer among the joint purchasers pays the prize price by applying the discounted discount rate to each buyer's purchase by lottery. E-commerce can be activated by increasing the buyer's participation in joint purchases by refunding the winning amount of the discounted amount, or by earning the amount of the discounted amount of cyber money or mileage.

In addition, according to the present invention, the possibility of winning the differential discount rate can be adjusted to further increase the effect of the present invention.

Claims (4)

A method of joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchase product of each purchaser for each total number of purchases of two or more buyers, Transmitting differential product discount information of 0% to 100% of at least two types of each purchase product of the buyers for each sale product information and the total number of purchases of each of the two or more buyers; Requesting the purchase of goods by the buyer; The buyer pays for the goods; To close the joint purchase, Determining a discount rate to be applied to the goods purchased by the buyer by lot; Refund to the buyer or the equivalent of the discount rate, the joint purchase method comprising the step of accumulating in the buyer account. A method of joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchase product of each purchaser for each total number of purchases of two or more buyers, Transmitting differential product discount information of 0% to 100% of at least two types of each purchase product of the buyers for each sale product information and the total number of purchases of each of the two or more buyers; Requesting the purchase of goods by the buyer; To close the joint purchase, Determining a discount rate to be applied to the goods purchased by the buyer by lot; And purchasing the purchaser by subtracting the amount of the winning discount from the normal price of the product. A device for making a joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchased product of each of the two or more buyers, Memory; And A processing device connected with the storage device, The storage device stores a program for controlling the processing device. The processing device, For each item of sale and the total number of purchases of each of the two or more buyers, the differential discount rate information of 0% to 100% of at least two types of each purchaser of each buyer is transmitted to the buyer, Receiving the purchase request of the product from the buyer, Process the buyer's payment for the goods; Close the joint purchase, Determine the discount rate to be applied to the goods purchased by the buyer by lottery, And operate by a program that refunds the purchaser equivalent amount to the buyer or accumulates in a buyer account. A device for making a joint purchase using a computer to apply a differential discount rate of 0% to 100% for each purchased product of each of the two or more buyers, Memory; And A processing device connected with the storage device, The storage device stores a program for controlling the processing device. The processing device, For each item of sale and the total number of purchases of each of the two or more buyers, the differential discount rate information of 0% to 100% of at least two types of each purchaser of each buyer is transmitted to the buyer, Receiving the purchase request of the product from the buyer, Close the joint purchase, To determine the discount rate to be applied to the buyer's purchases by lot, And a program for processing a payment procedure of an amount obtained by subtracting the winning discount equivalent amount from the normal price of the buyer's product.