@MTabarrok The difference between #2 and #4 is subtle and philosophically fascinating.
Though it gets weird in today's real world where a large fraction of the cost of boxes comes from risk aversion and regulation.
@MTabarrok#2和#4之间的区别是微妙的，在哲学上是迷人的。
尽管在今天的现实世界中，盒子的成本很大一部分来自风险规避和监管，这变得很奇怪。