JP2018132919A - Rebound effect calculation system and redound effect calculation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable evaluation of rebound effect in consideration of factors that can cause the rebound effect due to the use of ICT service in a comprehensive manner.SOLUTION: A rebound effect calculation system comprises: a first calculation unit for calculating, as rebound effect according to surplus time, a product of the surplus time resulting from the use of ICT service and a basic unit of COemission per unit surplus time; a second calculation unit for calculating, as rebound effect based on a surplus cost, a product of a result, obtained by subtracting a product of the surplus time and the cost consumption basic unit per unit surplus time from the sum of the surplus cost by purchasing the commodity using the ICT service and the surplus cost due to the movement substitution in the use of the ICT service, and the basic unit of COemission per unit surplus cost; and a third calculation unit for summing the rebound effect based on the surplus time and the rebound effect based on the surplus cost to calculate a total rebound effect.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rebound effect calculation system and a rebound effect calculation method.

  In recent years, the progress of the ICT society has brought about great changes in the lives of industry and people. In terms of the environment, there is a possibility that the environmental burden will be greatly reduced by dematerialization and transfer substitution. Many ICT service providers evaluate the results and use the evaluation results as the environmental effects of the service. It is used for the appeal and CSR activities of the company.

Many of the environmental load reduction effects due to the use of ICT products and services are described in ITU-T (International Telecommunication Union Telecommunication Standardization Sector). 1410 is calculated by quantitative comparison with the environmental load (CO ₂ emission amount) of conventional means (Non-Patent Documents 1 and 2).

  Utilization of the time and money generated by the efficiency of production / consumption activities by the ICT service causes new actions, and a new environmental burden (hereinafter referred to as “rebound effect”). It has been pointed out that the rebound effect may offset the environmental load reduction effect depending on the type of ICT service and the usage method (Non-patent Document 3). Therefore, it is important to consider the rebound effect when evaluating the environmental impact of ICT use.

  Examples of existing calculation methods related to the rebound effect include Non-Patent Documents 4 and 5. In Non-Patent Document 5, as shown in the following formulas 1 and 2, the rebound effect is obtained in each item of time and cost surplus by using the ICT service as compared with the conventional means, and then those A method for calculating a total rebound effect by summing up values has been proposed.

Information and Communication Technology Committee, “JT-L1410 Environmental Impact Assessment Methodology for ICT Products, Networks and Services” Ministry of Internal Affairs and Communications, “Outline of Environmental Impact Assessment Methods Using ICT” Lorenz M. Hilty, “ICT Innovations for sustainability” Takayo Kaneko et al., “Possibility of Telework as a Reducing Environmental Impact”, Journal of Japan Telework Society Vol.9 No2, pp56-65,2011 Zhang et al., “Study on Evaluation of Rebound Effect Using ICT”, 2016 Society Conference Proceedings Basic Survey on Social Life Results based on Questionnaire A Lifetime, [online], Internet <URL: http://www.stat.go.jp/data/shakai/2011/h23kekka.htm> Kotaro Kawajiri et al., “Environmental impact assessment of rebound effect associated with consumer saving behavior based on questionnaire survey”, Abstracts of Lecture Meeting of LCA Society of Japan 2011 Recipe blog, simple shopping questionnaire, [online], Internet <URL: http://www.recipe-blog.jp/okaimono/enq2011> NHK Broadcasting Culture Research Institute 2010 National Lifetime Survey Report, [online], Internet <URL: http://www.nhk.or.jp/bunken/summary/yoron/lifetime/pdf/110223.pdf>

  However, in the existing technology (Non-Patent Document 5), both the surplus time and the surplus cost are considered by using the ICT service. However, the surplus cost is an action that becomes unnecessary by using the ICT service. Only the cost of goods and goods (that is, transportation costs such as fares for transportation alternatives) is considered.

  For example, ICT services such as online shopping can save time and costs for travel as an alternative to travel, and for ICT service users, more information can be easily obtained by using the ICT service. It becomes possible to obtain it, and the same product can be purchased at a lower price. According to the questionnaire, ICT users see the difference in purchase price (price down) between the destination (store, etc.) and online shopping as a surplus cost, leading to new behavior (rebound effect occurs) Became clear.

  From the above, the evaluation method according to Non-Patent Document 5 has a problem that the rebound effect caused by the excess cost due to the price reduction of the product or the service itself using ICT is not considered.

  The present invention has been made in view of the above points, and an object of the present invention is to make it possible to evaluate the rebound effect by comprehensively considering factors that may cause the rebound effect associated with the use of the ICT service.

Therefore, in order to solve the above-mentioned problem, the rebound effect calculation system calculates the product of the surplus time generated by using the ICT service and the CO ₂ emission basic unit per unit surplus time as a rebound effect by the surplus time. A surplus cost by purchasing a product by using the ICT service, and a surplus cost by moving substitution in using the ICT service, the surplus time and a cost consumption basic unit per unit surplus time, A second calculation unit that calculates a product of the result of subtracting the product of CO ₂ emissions per unit surplus cost as a rebound effect due to the surplus cost, a rebound effect due to the surplus time, and the surplus cost And a third calculation unit for calculating the total rebound effect.

  The rebound effect can be evaluated by comprehensively considering factors that may cause the rebound effect associated with the use of the ICT service.

It is a figure which shows the hardware structural example of the rebound effect calculation apparatus 10 in embodiment of this invention. It is a figure which shows the function structural example of the rebound effect calculation apparatus 10 in embodiment of this invention. It is a flowchart for demonstrating an example of the process sequence which the rebound effect calculation apparatus 10 performs. It is a figure which shows the structural example of price down rate DB26. It is a figure for demonstrating the calculation example of the cost consumption per unit surplus time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a new action occurs due to the use of time and money generated by the efficiency of ICT (Information and Communication Technology) service, and a new environmental load (hereinafter referred to as “rebound effect”) occurs. ) Will be described. The ICT service refers to all services provided using information communication technology.

  In the present embodiment, the total rebound effect of ICT service i is evaluated using the following evaluation formulas (Formula 3 to Formula 8).

式３は、ＩＣＴサービスｉの利用による総リバウンド効果ＲＥ_（ｉ）が、余剰時間によるリバウンド効果ＲＴ_（ｉ）と余剰コストによるリバウンド効果ＲＣ_（ｉ）との２項目の合計値で算出されることを示す。

Equation 3 indicates that the total rebound effect RE _(i) due to the use of the ICT service i is calculated by the total value of two items, the rebound effect RT _(i) due to the surplus time and the rebound effect RC _(i) due to the surplus cost. Indicates.

Equation 4 shows that the rebound effect RT _(i) due to the surplus time due to the user u (organization or individual) using the ICT service i occurs in the surplus time T _(i) due to the use of the ICT service i and the unit surplus time. CO ₂ emissions from new user behavior u to (hereinafter, referred to. "CO ₂ emission intensity per unit time surplus") indicates that it is calculated by the product of the ES T _(u).

Equation 5 shows that the rebound effect RC _(i) due to the surplus cost due to the user u using the ICT service i is the actual surplus cost Inc _(i) due to the use of the ICT service i and the user surplus generated by the unit surplus cost. CO ₂ emissions from new action (hereinafter, referred to _as. "CO ₂ emission intensity per unit excess _cost") is meant to be calculated by the product of the _{ES Inc (u).}

Equation 6 shows that the actual surplus cost Inc _(i) due to the use of the ICT service i includes the surplus cost Incm _(i) due to the movement substitution when the ICT service i is used as an alternative means of movement, and the ICT service. This indicates that two items, i.e., a purchased product by using i and a surplus cost Incp _(i) due to a price reduction of the use service (ICT service i) itself are included. However, in Formula 6, in order to avoid double counting of the evaluation in the surplus time term and the surplus cost term, the cost consumption Cost _{(i) of} the action newly generated in the surplus time is the two surplus costs (Incm _(i) , Incp _(i) ). Further, when the cost consumption Cost _(i) Cost of action newly generated surplus time is moved alternatively excess cost INCM _(i) and the sum or the excess cost IncP _(i) according to item price down by the substantially Since no surplus of cost occurs and there is no need to re-record the rebound effect RC _(i) due to the surplus cost, the real surplus cost Inc _(i) is set to zero.

Equation 7 shows that the surplus cost Incp _(i) due to the price reduction (decrease in price) in the use of the ICT service i is the price (price) P _{(n) of the} product / service n purchased through the use of the ICT service i. , It is calculated based on the price down rate R _{(k) of the} classification k to which the product / service n belongs. Price P _(n) is a price when purchased using the ICT service i. Therefore, in Equation 7, P _(n) ÷ (1−R _(k) ) corresponds to the price of the product / service n when the ICT service i is not used. That is, Incp _(i) is a surplus cost due to purchasing a product by using the ICT service i.

Equation 8 shows that the cost consumption Cost _{(i) of} the action newly generated in the surplus time due to the use of the ICT service i is the product of the surplus time T _(i) and the cost consumption basic unit EC _(u) per unit surplus time. It is calculated by.

  In addition, since it is thought that newly generated behavior varies greatly depending on whether the surplus items in each surplus item are owned by individuals or owned by organizations such as companies or governments, they are owned by surplus items and organizations owned by individuals. The surplus is evaluated separately.

  Further, in the present embodiment, the cost means an expense, and the amount is evaluated by the amount. For example, the movement cost refers to an expense necessary for movement.

  Hereinafter, the rebound effect calculation apparatus 10 that calculates the rebound effect by the above evaluation method will be described in detail.

  FIG. 1 is a diagram illustrating a hardware configuration example of a rebound effect calculation apparatus 10 according to an embodiment of the present invention. The rebound effect calculation device 10 in FIG. 1 includes a drive device 100, an auxiliary storage device 102, a memory device 103, a CPU 104, an interface device 105, a display device 106, an input device 107, and the like that are mutually connected by a bus B. .

  A program that realizes processing in the rebound effect calculation apparatus 10 is provided by a recording medium 101 such as a CD-ROM. When the recording medium 101 storing the program is set in the drive device 100, the program is installed from the recording medium 101 to the auxiliary storage device 102 via the drive device 100. However, the program need not be installed from the recording medium 101 and may be downloaded from another computer via a network. The auxiliary storage device 102 stores the installed program and also stores necessary files and data.

  The memory device 103 reads the program from the auxiliary storage device 102 and stores it when there is an instruction to start the program. The CPU 104 realizes functions related to the rebound effect calculation device 10 according to a program stored in the memory device 103. The interface device 105 is used as an interface for connecting to a network. The display device 106 displays a GUI (Graphical User Interface) or the like by a program. The input device 107 includes a keyboard and a mouse, and is used for inputting various operation instructions.

  Note that the rebound effect calculation apparatus 10 may be configured by a plurality of computers each having the hardware configuration illustrated in FIG. 1.

FIG. 2 is a diagram illustrating a functional configuration example of the rebound effect calculation apparatus 10 according to the embodiment of the present invention. In FIG. 2, the rebound effect calculation device 10 includes an input unit 11, a time term effect calculation unit 12, a surplus time cost consumption calculation unit 13, a cost term effect calculation unit 14, a total rebound effect calculation unit 15, an output unit 16, and the like. . Each of these units is realized by processing that one or more programs installed in the rebound effect calculation apparatus 10 cause the CPU 104 to execute. The rebound effect calculation apparatus 10 also includes a surplus time DB 21, a unit surplus time CO ₂ emission basic unit DB 22, a unit surplus time cost consumption basic unit DB 23, a movement alternative surplus cost DB 24, a price DB 25, a price down rate DB 26, and a unit surplus cost CO. ₂ Database such as emission unit DB27 is used. Each of these databases can be realized by using, for example, a storage device that can be connected to the auxiliary storage device 102 or the rebound effect calculation device 10 via a network.

  The input unit 11 receives input of information necessary for calculating the total rebound effect from the user (evaluator). For example, each time an evaluation is made, the input unit 11 includes a surplus time T due to movement substitution, a surplus cost Incm due to movement substitution, a price P of a commodity / service n to be purchased by using an ICT service to be evaluated, and a commodity classification of the commodity / service. An input such as k is accepted, the surplus time T due to movement substitution is stored in the surplus time DB 21, the surplus cost Incm due to movement substitution is stored in the movement substitution surplus cost DB 24, and the price P is stored in the price DB 25.

  Based on Equation 4, the time term effect calculation unit 12 calculates the rebound effect RT based on the surplus time related to the individual or the organization.

  The surplus time cost consumption calculation unit 13 calculates a cost consumption Cost newly generated in the surplus time based on the equation (8).

The cost term effect calculation unit 14 calculates the rebound effect RC due to the surplus cost based on Equations 5 to 7.
The total rebound effect calculation unit 15 calculates the total rebound effect based on Equation 3.

The unit time surplus CO ₂ emissions per unit DB 22, the intensity ES _T of CO ₂ emissions per unit time surplus of individuals, each of the basic unit ES _T of CO ₂ emissions per unit time surplus tissue It is remembered.

  The unit surplus time cost consumption basic unit DB 23 stores a cost consumption basic unit EC per unit surplus time of an individual and a cost consumption basic unit EC per unit surplus time of the organization.

  The price down rate DB 26 stores the price down rate R (decrease rate) of each product category.

The unit surplus cost CO ₂ emission unit DB 27 stores CO ₂ emission unit ES _Inc per unit unit surplus cost and CO ₂ emission unit ES _Inc per unit unit surplus cost. .

  The output unit 16 outputs the total rebound effect calculated by the total rebound effect calculation unit 15. For example, the total rebound effect may be displayed on the display device 106.

  Hereinafter, the process procedure which the rebound effect calculation apparatus 10 performs is demonstrated. FIG. 3 is a flowchart for explaining an example of a processing procedure executed by the rebound effect calculation apparatus 10.

In step S101, the input unit 11 displays information i indicating the type of the ICT service to be evaluated (hereinafter referred to as “target service”), a surplus time T _(i) generated by the use of the target service i, and surplus due to movement substitution. Cost Incm _(i) , price P _(n) of purchased product n, classification k of purchased product n, owner of surplus (surplus time T, surplus cost Incm due to mobile substitution) generated by the target service i (hereinafter “target” An input of information u (individual or organization) indicating a classification of “user u”) is accepted. The surplus time T _(i) is stored in the surplus time DB 21. The surplus cost Incm _{(i) due} to the movement substitution is stored in the movement substitution surplus cost DB 24. Price P _(n) is stored in the price DB 25.

Subsequently, the time term effect calculation unit 12 stores the surplus time T _(i) stored in the surplus time DB 21 for the target service i and the target user u, and the unit surplus time CO ₂ emission basic unit DB 22 for the target user u. The rebound effect RT _(i) due to the surplus time is calculated by applying the CO ₂ emission basic unit EST _(u) per unit surplus time to Equation 4 (S102). The CO ₂ emission basic unit EST _(u) per unit surplus time is created based on, for example, Non-Patent Document 4, and is stored in the unit surplus time CO ₂ emission basic unit DB 22 in advance.

Subsequently, the surplus time cost consumption calculation unit 13 stores the surplus time T _(i) stored in the surplus time DB 21 regarding the target service i and the target user u, and the unit surplus time cost consumption basic unit DB 23 regarding the target user u. The cost consumption basic unit EC _(u) per unit surplus time is applied to Equation 8 to calculate the cost consumption Cost _(i) newly generated in the surplus time (S103). An example of a method for calculating cost consumption per unit surplus time will be described later.

Subsequently, the cost term effect calculator 14 has the price P _(n) of the product / service n stored in the price DB 25 and the price down rate R _{(k) of the} product classification k stored in the price down rate DB 26. Is applied to Equation 7 to calculate the surplus cost Incp _(i) due to the price reduction of the product (S104).

  FIG. 4 is a diagram illustrating a configuration example of the price down rate DB 26. As shown in FIG. 4, in the price down rate DB 26, for each combination of the product category and the ICT service to be used, when the ICT service is used, the price down rate (the price reduction) for the product belonging to the product category. Rate) is stored. Accordingly, in step S104, the price down rate stored for the combination of the product category k and the target service i is acquired from the price down rate DB 26.

  The information stored in the price down rate DB 26 may be created based on, for example, a questionnaire survey using the Web, or may be created based on other publicly available information.

Subsequently, the cost term effect calculation unit 14, the surplus cost Incm by moving alternatively stored in the mobile alternative surplus cost DB24 and _(i), the sum of the surplus cost IncP _(i) according to item price down, in the time range A value obtained by subtracting the newly generated cost consumption Cost _(i) is calculated (S105).

When the calculation result in step S105 exceeds 0 (Yes in S105), the cost term effect calculation unit 14 sets the calculation result as the actual surplus cost Inc _(i) (S106). When the calculation result in step S105 is 0 or less (No in S105), the cost term effect calculation unit 14 sets the actual surplus cost Inc _(i) to 0 (S106).

Subsequently, the cost term effect calculation unit 14 is substantially the surplus cost _{Inc (i),} CO ₂ emissions per unit _{ES Inc} per unit excess cost stored in the unit surplus cost CO ₂ emissions rate DB27 respect the target user u _(U) is applied to Equation 5 to calculate the rebound effect RC _(i) due to the surplus cost (S107). The unit CO ₂ emissions per unit of excess cost, for example, be prepared in accordance with Non-Patent Document 7, it is stored in advance in the unit surplus cost CO ₂ emissions per unit DB 27.

Subsequently, the total rebound effect calculation unit 15 calculates the total rebound effect RE _(i) by applying the rebound effect RT _(i) due to the surplus time and the rebound effect RC _(i) due to the surplus cost to Equation 3 (S108 _). ).

Subsequently, the output unit 16 outputs the calculated total rebound effect RE _(i) (S109).

Next, an example in which the present embodiment is applied to a specific case will be described. As a specific example, an evaluation example of a rebound effect by using an individual online shopping (clothing) once will be described. In the evaluation example, the following are the evaluation conditions.
・ Purchase price for clothes in online shopping: ¥ 3,600 ・ Movement time to shops that often purchase clothes: 1 hour ・ Transportation cost to shops that often purchase clothes: ¥ 500 In this case, the rebound effect RT due to the surplus time is calculated by surplus time T by use of online shopping × CO ₂ emission amount per unit surplus time (CO ₂ emission basic unit ES _T per unit surplus time). Since the travel time of 1 hour is surplus from the evaluation condition, the surplus time T = 1. Further, for example, from non-patent document 4, when a value of 0.43 kg-CO ₂ per hour is used, the rebound effect RT due to the surplus time is calculated as follows.
Rebound effect RT due to surplus time (per use) = 1 hour × 0.43 kg-CO ₂ /hour=0.43 kg-CO ₂
Further, the cost consumption Cost of the action newly generated in the surplus time is calculated by the surplus time T by the use of online shopping × the cost consumption EC per unit surplus time. Since the travel time of 1 hour is surplus from the evaluation condition, the surplus time T = 1. Further, as the cost consumption EC per unit surplus time, a value obtained by calculating the consumption in the time allocation by defining the activity excluding the primary activity, commuting / commuting, and work from the non-patent document 6 as the surplus time. When 198 thousand yen / hour is used, the cost consumption Cost of the action newly generated in the surplus time is calculated as follows.
Cost consumption of actions newly generated in surplus time Cost = 1 hour × 0.198 thousand yen / hour = 0.198 thousand yen Specifically, 0.198 thousand yen is a social society as shown in FIG. The survey results for 35-39-year-olds in the life time section (Non-Patent Document 6) of the questionnaire A of the basic life survey are used and calculated. Here, primary activities, commuting / commuting, and activities other than work are defined as activities performed in surplus time, and it is assumed that consumption occurs in relation to shopping and travel among activities performed in surplus time. The amount of shopping consumed is calculated by dividing the purchase amount per purchase (30s) according to the questionnaire survey results (Non-Patent Document 8) by the average shopping time per time (Non-Patent Document 9). Find the shopping amount and then multiply by the percentage of time. The amount of travel consumed is obtained by multiplying the amount of time per travel time (for example, rail fare) by the percentage of time. As a result, consumption related to shopping and transportation is 0.198 thousand yen. That is, for example, the value obtained in this way is stored in the unit surplus time cost consumption basic unit DB 23.

In addition, the rebound effect RC due to surplus cost is (surplus cost Incm due to mobile substitution + surplus cost due to price reduction of purchased product itself using online shopping-cost consumption of action newly generated in surplus time) x per unit surplus cost They are calculated by CO ₂ emissions (CO ₂ emissions intensity per unit of surplus cost). From the evaluation conditions, the train fare 500 yen due to the use of online shopping is surplus, so the surplus cost Incm = 500 yen due to the movement substitution. Further, the price down rate is 25% based on the evaluation conditions. Therefore, the price down portion of the cost is 1.2,000 yen = 3,600 yen / (1-25%) × 25%. As the CO ₂ emission amount per unit surplus cost, a value of 2.4 kg-CO ₂ per 1,000 yen is used from Non-Patent Document 7. Therefore, the rebound effect RC due to the surplus cost is calculated as follows.
Excess (per use) rebound effect RC from cost = (0.5 thousand +1.2 thousand yen -0.198 thousand yen) × 2.4kg-CO ₂ / ¥ = 3.60kg-CO ₂
From the above, the total rebound effect RE in this specific example is calculated as follows.
Total rebound effect RE = 0.43 kg-CO ₂ +3.60 kg-CO ₂ = 4.03 kg-CO ₂ / Online shopping (clothing) 1 use As described above, according to this embodiment, the use of the ICT service Evaluate without taking into account double counts, comprehensively considering the time and cost surplus in mobile substitution, and the rebound effect caused by the surplus cost generated by the price reduction of purchased products and use services themselves by using ICT It becomes possible. That is, it is possible to evaluate the rebound effect by comprehensively considering factors that may cause the rebound effect associated with the use of the ICT service.

  The rebound effect calculation device 10 is an example of a rebound effect calculation system. The time term effect calculation unit 12 is an example of a first calculation unit. The cost term effect calculation unit 14 is an example of a second calculation unit. The total rebound effect calculation unit 15 is an example of a third calculation unit.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to such specific embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation・ Change is possible.

DESCRIPTION OF SYMBOLS 10 Rebound effect calculation apparatus 11 Input part 12 Time term effect calculation part 13 Surplus time cost consumption calculation part 14 Cost term effect calculation part 15 Total rebound effect calculation part 16 Output part 21 Surplus time DB
22 Unit surplus time CO ₂ emission basic unit DB
23 Unit Surplus Time Cost Consumption Unit DB
24 Moving alternative surplus cost DB
25 Price DB
26 Price down rate DB
27 Unit surplus cost CO ₂ emission basic unit DB
100 drive device 101 recording medium 102 auxiliary storage device 103 memory device 104 CPU
105 interface device 106 display device 107 input device B bus

Claims (6)

A first calculation unit for calculating a product of a surplus time generated by using the ICT service and a CO ₂ emission basic unit per unit surplus time as a rebound effect by the surplus time;
The product of the surplus time and the cost consumption basic unit per unit surplus time is calculated from the sum of the surplus cost by purchasing the product by using the ICT service and the surplus cost by moving substitution in using the ICT service. A second calculation unit that calculates the product of the result of subtraction and the basic unit of CO ₂ emissions per unit surplus cost as a rebound effect due to the surplus cost;
A third calculation unit for calculating a total rebound effect by summing up the rebound effect due to the surplus time and the rebound effect due to the surplus cost;
The rebound effect calculation system characterized by having. The second calculation unit is configured such that a product of the surplus time and a cost consumption basic unit per unit surplus time is a surplus cost due to purchase of a product by using the ICT service, and movement by using the ICT service. If it is equal to or more than the total surplus cost due to substitution, the rebound effect due to the surplus cost is set to 0.
The rebound effect calculation system according to claim 1. The second calculation unit is configured to purchase a product by using the ICT service based on a price of the product purchased by using the ICT service and a rate of decrease in the price by using the ICT service. Calculate the cost,
The rebound effect calculation system according to claim 1 or 2. A first calculation procedure for calculating a product of a surplus time generated by using the ICT service and a CO ₂ emission basic unit per unit surplus time as a rebound effect by the surplus time;
The product of the surplus time and the cost consumption basic unit per unit surplus time is calculated from the sum of the surplus cost by purchasing the product by using the ICT service and the surplus cost by moving substitution in using the ICT service. A second calculation procedure for calculating a product of the result of subtraction and the basic unit of CO ₂ emissions per unit surplus cost as a rebound effect due to the surplus cost;
A third calculation procedure for calculating a total rebound effect by summing up the rebound effect due to the surplus time and the rebound effect due to the surplus cost;
A rebound effect calculation method characterized in that a computer executes. In the second calculation procedure, the product of the surplus time and the cost consumption basic unit per unit surplus time is a surplus cost due to purchase of a product by using the ICT service, and movement by using the ICT service. If it is equal to or more than the total surplus cost due to substitution, the rebound effect due to the surplus cost is set to 0.
The rebound effect calculation method according to claim 4. The second calculation procedure is based on the price of the product purchased by using the ICT service and the rate of decrease in the price by using the ICT service, and surplus by purchasing the product by using the ICT service. Calculate the cost,
6. The rebound effect calculation method according to claim 4, wherein the rebound effect is calculated.

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