Americans learned some difficult lessons in Great Recession. The question arising from two recent studies of financial habits before and after the crisis is whether we learned them too well.

On the one hand, the crisis made us more frugal, according to "Five Years After," a report released this week by Fidelity Investments. Some 42 percent of 1,154 rank-and-file investors interviewed said they are contributing more to 401(k)s, IRAs or health savings accounts.