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Evaluation of a consumer incentive program for an energy-efficient product in South Korea

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Abstract

Because green products are expected to reduce environmental pollution, save natural resources, and protect public health, they are regarded as a useful instrument of sustainable economic growth. Although many policies exist to promote the purchase of green products, their successful adoption requires the voluntary participation of individual consumers and the implementation of an appropriate incentive system. This study presents an ex ante evaluation of consumer preferences when faced with an incentive program that aims to promote the purchase of green products, specifically an energy-efficient LCD television. By using a conjoint analysis with a mixed logit model, we explore the effects of the incentive program on electric power consumption and the consequential reduction in greenhouse gas emissions in South Korea. Our simulation results suggest that when a consumer receives both 5 % of the purchase price of the green product in the form of “incentive points” and a one-million Korean won income tax deduction, the electric power consumption of LCD televisions nationwide will reduce by 50 GWh, thus reducing overall CO2 emissions by 21,200 t.

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Notes

  1. The Intergovernmental Panel on Climate Change (2014) report estimates that global economic losses would be 0.2–2.0 % of income given a global mean temperature rise of up to 2.5 °C.

  2. Throughout this paper, an energy-efficient LCD TV is defined as an LCD TV that consumes less power compared with other LCD TVs.

  3. Examples include applications of DCMs in the context of a new electronic payment system for credit cards (Kim et al. 2007a), an electric vehicle (Ewing and Sarigollu 2000; Hong et al. 2012; Kim et al. 2007b; McFadden and Train 2000), and a new telecommunications service (Ahn et al. 2006; Lee et al. 2006).

  4. For the detailed estimation procedures, see Koop et al. (2007) and Rossi et al. (2005).

  5. Gender: male (50.1 %), female (49.4 %)

    Age: 20s (21.5 %), 30s (26.3 %), 40s (28.2 %), 50s (24.0 %)

  6. Other potential attributes not included in this survey (such as brand and resolution) are assumed to be identical across options. Moreover, this assumption was explained in detail to all respondents.

  7. In South Korea, electric charges are imposed based on a progressive scale; the rate was 258.7 KRW/kWh for the 300–400-kWh range in July 2011.

  8. Although a consumer can use these accumulated points in many ways, the cash-back option was assumed to be the only viable one because of the complexity of the survey. This means that consumers are able to use saved points at affiliated stores instead of exchanging them for cash.

  9. According to the tax laws of South Korea, if a person earns 50 million KRW annually and receives an additional benefit of a 2-million KRW tax deduction, he/she may save approximately 0.2 million KRW per year in tax.

  10. Similarly, tax deductions are also given for energy saving buildings in Japan, high-efficiency household items in the USA, and purchasing public transport tickets in Canada.

  11. The estimation model was described in “Model specifications.”

  12. In general, the parameters in a mixed logit model are assumed to have normal distributions, with the exception of some attributes that have specific signs. Those are usually assumed to be log-normal distributions to ensure that the parameters have either positive or negative values (Train 2009). The attributes “point-saving rate,” “additional tax deduction,” and “TV price” are assumed to be log-normal distributions; the other attributes are assumed to be normally distributed.

  13. A total of 100 datasets were collected from a commercial transaction website in South Korea (http://www.danawa.com/).

  14. The statistical significance of D SONY _ r has a minor effect on the overall research stream because the important consideration for a market simulation is the relationship between the price of a TV and its energy efficiency level, not the brand variable.

  15. The power consumption of each grade is calculated from the energy thresholds of the Ministry of the Knowledge Economy (2011) by assuming that all TVs are identical in terms of screen size (40 in.) and 3D functionality.

  16. The price of TVs in each grade is calculated by using Eq. 10. The average price (1.65 million KRW) is fixed as the reference price for third-grade TVs, and the prices for the other four grades are subsequently calculated by using the estimation result (−3545 KRW/1 W).

  17. Poorly conceived incentive programs might lead to adverse effects. For example, Jacob and Levitt (2003) analyze the relationship between incentives for teachers and their cheating behavior. Levitt and Dubner (2005) also suggest the case of fine imposition to show how poorly designed incentive systems may lead to failure. However, it is difficult to quantify the adverse and/or negative effect of an incentive program because it is not easy to grasp the adverse behavior of individual actors, not to mention collect such behavior as usable data.

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Acknowledgments

This research was funded by the Korea Environment Institute under Grant GP 2011-06.

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Correspondence to Misuk Lee.

Appendix

Appendix

Table 10 shows the estimation results of the conditional logit model with the same dataset. If IIA exists, the choice probability of two alternatives should not be changed when irrelevant alternatives vary. In order to test the IIA assumption, we conduct the same estimation without the highest level of energy consumption (250 W) alternative and compare it with the results in Table 10. The Hausman test results suggest that the IIA assumption should be rejected at a significance level of 1 %. Thus, it is reasonable to use the mixed logit model, which relaxes the IIA assumption.

Although the IIA assumption is violated, the conditional logit model might be useful because it can analyze the effect of socioeconomic variables by inserting interaction terms between attributes and sociodemographic variables. However, we can find only a few meaningful interaction terms when we use gender and age as socioeconomic variables. Therefore, it is reasonable to use the mixed logit model in this paper.

Table 10 Estimation results of the conditional logit model

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Cho, Y., Koo, Y., Huh, SY. et al. Evaluation of a consumer incentive program for an energy-efficient product in South Korea. Energy Efficiency 8, 745–757 (2015). https://doi.org/10.1007/s12053-014-9319-x

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