Why the higher paid should work longer than the rest
为什么高收入者应该更晚退休

If everyone worked 43 years, the garbage collector might retire at 60 and the lawyer at 67
库柏：我们不应该设定退休年龄，而是应该计算工作年限。让低收入和高收入两个群体的人工作到同一年龄再退休是残酷的。