Some of the gains in weekly earnings can be attributed to an increase in the length of the average workweek. At the start of the period, the private-sector workweek averaged 33.0 hours per week, while by December 2011, the workweek had increased moderately to 33.8 hours. This is a gain of 2.4 percent.
However, most of the wage gains were due to gains in average hourly earnings, which rose from $21.52 to $22.30, an increase of 3.6 percent over the two-year period.
So, many workers are working longer hours and getting paid a little more per hour. These two factors, when multiplied, have resulted in gains in average weekly earnings for the typical Oregon payroll employee.