地層下陷是不可逆現象，本實驗假設地方政府設立永續經營地方產業提案，透過外部效益的補貼，減緩環境遭受衝擊，衡量受試者的時間偏好率差異。然而，時間偏好率等同於受試者對時間的期望報酬率。因此，本研究結合有無跨代回溯實驗、居住地遭受地層下陷衝擊、教育程度、社會價值傾向與風險趨避程度等等的因素，探討哪些因素能有效降低受試者對永續產業提案的期望報酬率。
本研究將實驗地點分為社區與學校實驗，社區實驗以社區居民為受試者，在遭受地層下陷衝擊地區與沒有地層下陷的地區進行，學校實驗則以學生為受試者，兩實驗皆隨機選取各半數受試者進行跨代回溯觀點，並使用 Tobit model 分析受試者時間偏好率會受到哪些變數影響。實證結果發現社區實驗中，學歷、年齡越高受試者以及曾連署環保議題請願書之受試者，傾向支持此提案讓地方產業永續，願意遞延至未來領取報酬，時間偏好率降低；學校實驗發現，居住最久地區為外國之受試者，對於產業造成的環境衝擊意識較低，時間偏好率提高。雖然跨代回溯實驗效果僅在學校實驗中出現，但與過去相關的環境態度，影響受試者對地方產業永續提案的看法，仍表示回顧過去的行為有一定的效果。

Land subsidence is irreversible phenomenon. As a consequence, This experiment assumes that the local government establishes a sustainable local industry proposal to mitigate environmental impacts through subsidies of external benefits, and measures the difference in time preference rates of the subjects. And then, the rate of time preference is equivalent to the expected rate of return. So The subjects' time preference may be affected by the non-retrospective viewpoints or retrospective viewpoints treatment, the impact of land subsidence in their place of residence, education level, social value orientation and risk aversion, etc. This research examine which factors are effective in decreasing the expected rate of return on the proposal of the sustainable industry.
In this research, the experimental sites were divided into community and school experiments. The community experiments were conducted with community residents as subjects who suffered from the impact of land subsidence and without land subsidence, and then the school experiments were conducted with NCKU students as subjects. In both experiment sites, half of the subjects were randomly selected for the intergenerational retrospective viewpoints, and then the Tobit model was used to analyze the data. The analysis result of community experiment reveals that the subjects who is higher education, age and those who had signed a petition about environmental issues. They tended to support the proposal to make local industries sustainable, deferring the payment to the future and reducing the time preference rate. The school experiment found that the subjects who had lived abroad for long time, be less awareness of environmental and therefore they had higher time preference rates. Furthermore, the effect of the intergenerational retrospective viewpoints experiment was only seen in the school data, and then the environmental attitudes associated with the past influenced the subjects' perceptions of local industry sustainability proposals, indicating that the retrospective behavior has some effect.

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