Are We in a Mattress-Store Bubble?

6/9/2016, 3:00:00 AM , duration(0:0:2)
economics freakonomics itunes life mattress sleep stephen_dubner steve_levitt
<p>You've seen them -- everywhere! -- and often clustered together, as if central planners across America decided that what every city really needs is a Mattress District. There are now dozens of online rivals too. Why are there so many stores selling something we buy so rarely?</p>