Part of the problem is too many Americans are taking fewer good risks and more bad ones, says Allison Schrager for Bloomberg Opinion. NEW YORK: There is a frenetic, sweaty-palm feel to the United States economy lately. Markets are looking frothy and consumers are anxious , and meanwhile the gambling and stock markets are converging as people bet on all sorts of strange assets and events. Half of young men in the US have an online sports betting account, and some are developing a problem. All of