Using the Gallup World Poll, my colleagues at the Brookings Institution in Washington, DC, Carol Graham and Milena Nikolova, have found that the happiest cohorts are those who work part-time voluntarily. In exchange for longer work lives, citizens would have more time for both leisure and skill formation throughout their lives, with positive effects on productivity and life satisfaction.
我的华盛顿布鲁金斯研究所同事格雷厄姆（Carl Graham）和尼科洛娃（Milena Nikolova）通过盖洛普全球民调（Gallup World Poll）的数据发现，最幸福的人群是那些自愿参与兼职工作的人。作为延长工作寿命的交换，公民终其一生将拥有更长时间的闲暇和技能形成，有利于生产率和生活满意度的提高。