More recent findings report that in

最近的调查结果表明，收入对个人而言，按小时支付的幸福感比对薪水的幸福感强得多，这是由于其对自我价值感的影响。<br>跟踪人口报告的幸福水平随时间变化的研究也是有关此主题的有趣信息来源。自第二次世界大战以来，西欧大部分地区，美国和日本的人均国内生产总值已显着增加，但通过调查测得的人们的幸福感仅显示出温和的改善。据信，其中某些原因是由于技术进步对一代人（例如洗衣机）的生活方式产生了重大影响，这被后代所理所当然。这也与“享乐跑步机”的概念有关—请参见第8章。4。

最近的调查结果显示，收入与按小时支付的个人幸福感比与工资幸福的关系更强烈，因为收入对自我价值感的影响。<br>跟踪人口报告的幸福程度随时间变化的研究也是有关这一主题的有趣信息来源。自二战以来，西欧、美国和日本的人均国内生产总值（GDP）显著增加，但以调查衡量，人们的安全感只是有轻微的改善。据认为，其中一些是由于技术进步对一代人（如洗衣机）的生活方式产生了重大影响，而洗衣机被后代人认为是理所当然的。这也涉及到"享乐跑步机"的想法——见第4章。

More recent findings report that income is more strongly associated with happiness for individuals paid by the hour than by salary due to the impact on feelings of self-worth.Studies tracking changes in a population’s reported level of happiness over time are also an interesting source of information on this subject. Gross domestic product per capita has significantly increased in much of Western Europe, the USA and Japan since World War II, but people’s sense of well-being, as measured by surveys has shown only mild improvements. It is believed that some of this is due to technological advances that have a significant lifestyle impact on one generation e.g. the washing machine, that are taken for granted by subsequent generations. This also relates to the idea of the “hedonic treadmill”—see Chap. 4.<br>