Following the recession of 2001 there was a month where total employment increased and the unemployment rate rose. Assuming the computations were correct, how is it possible for both to have increased?

Teenage unemployment is higher than unemployment of people ages 20 and over. Explain why economists would attribute at least part of this difference to minimum-wage laws.

Since unemployment rates are consistently higher in Canada and some Western European countries than in the United States, it appears that the natural rate of unemployment is lower in the United States. What might explain this difference?