An increase in the number of workers in the economy results in an increase in productivity.

The average growth rate of output in the U.S. economy since 1900 has been about 3.4% per year.

The growth rate of productivity in the United States increased during the 1950s and 1960s; then it began to decrease after the early 1970s.

Since the early 1950s, the unemployment rate has gone up and down, but the labor-force participation rate has grown steadily.

If the labor force were more mobile, the unemployment rate would tend to be lower.

Between 1982 and 2000, the demographic group with the highest unemployment rate in the United States was African American women.

An increase in the number of discouraged workers results in an increase in the unemployment rate.

As jobs become more differentiated, the frictional unemployment rate tends to rise.

The sum of the frictional and the natural rates of unemployment equals the structural rate of unemployment.

During a recession, the rate of unemployment rises.