WASHINGTON (MarketWatch) — The April employment report exceeded expectations, with 165,000 jobs created and a welcome drop in the unemployment rate to 7.5%. But there was a dark side to the report: Total hours worked fell sharply, and the total amount of money earned by U.S. workers actually declined from the month before.“Aggregate weekly hours”....As the name implies, it measures the total number of hours worked, which is what matters for sizing up overall growth in the economy. Usually, we focus just on the number of new jobs created and the unemployment rate, but the number of hours we work...