というFT論説をサマーズが書いている(原題は「No free lunches but plenty of cheap ones」;H/T Economist's View)。 Trade-offs have long been at the center of economics. The aphorism “there is no such thing as a free lunch” captures a central economic idea: You cannot get something for nothing.... Yet I am increasingly convinced that “no free lunch” oversimplifies matters and makes economics too dismal a science. It would be