在學術界，一般都認為，不論是人際信任還是機構信任，都是正向影響幸福的變數。不過，這些結果也都未考慮兩者的內生性問題。本研究使用世界價值觀調查(World Value Survey)第三波至第五波(1994-2007)的資料，透過城市規模作為工具變數進行兩階段最小平方法，以避免內生問題後，發現信任對幸福不具有影響力。同時，本研究也作了使用工具變數前後的比較，可以知道信任與幸福之間確實是具有關係的，但是並非是信任影響幸福的關係。本研究推測，兩者的因果關係應是幸福影響信任，或者是有某個變數同時影響幸福與信任，但幸福與信任之間無直接關係。

In academic circles, it is generally believed that trust, be it interpersonal or institutional, is a variable with positive impact on happiness. Such beliefs, however, have not taken into consideration the endogeneity issues between the two. This research utilizes data from the third and fifth waves (1994-2007) of the World Value Survey (WVS) to apply a two-stage least-squares method using city size as an instrumental variable, to avoid endogeneity issues, and finds that trust does not impact happiness. Additionally, this research also conducts comparisons before and after applying the instrumental variable, and finds that trust is in fact related to happiness, but it is not a relationship in which trust impacts happiness. This research further conjectures that the causal relationship between the two should be that happiness impacts trust, or there exists a variable that simultaneously impacts both happiness and trust, but no direct relationships exist between happiness and trust.

第一章緒論
第一節研究動機與目的
第二節研究架構
第二章文獻探討
第一節人際信任與機構信任
第二節幸福與信任
第三節小結
第三章研究方法與模型架構
第一節資料來源與變數說明
第二節信任的量化（POLS模型）
第三節幸福的量化
第四節兩階段最小平方法
第五節實證步驟
第四章實證分析結果
第一節敘述統計分析
第二節實證分析與討論
第五章結論
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