Here's a quick quiz: Do more people moonlight today than did in the 1990s? Are workers without a high-school degree more likely to work a second job than college graduates? And do immigrants moonlight more often than native- born Americans?
I'd bet most people would answer yes to all three questions. If so, they would be wrong on all three -- at least according to the official data. The surprising reality of second jobs in America underscores the importance of using real data to examine the labor market. Casual guesses can be misleading.