There is some criticism that the official unemployment statistics understate the extent of joblessness in the United States. Which of the following statements represent shortcomings of the official unemployment rate reported by the Bureau of Labor Statistics each month?
I. Discouraged workers are not considered unemployed.
II. People who work part time but want to be working full time are considered employed.
III. The unemployment rate does not take the duration of unemployment into account.
IV. Retirees are not included in the labor force.