Puzzles: The Arbitrage Mirage, Wait Watchers, and More
提出三个受“绿色信封”悖论启发的交换谜题，以及两个关于外部性问题的长谜题，探讨如何设计社会惯例和收费系统以减少低效排队等待。
This feature begins with three puzzles motivated by the paradox of the “greener envelope,” which was described in detail in the Winter 1989 issue. Following these exchange paradoxes are two longer puzzles, also with answers provided at the end. The longer puzzles focus on externality problems: how to design social conventions and toll systems to minimize inefficient waiting in line. Answers can be found at the end of the problems.