Labor Services in a Country Might Be Underpriced Relative to Productivity

Multiple Choice

Labor services in a country might be underpriced relative to productivity because

A) workers are not allowed to freely move across national boundaries to seek higher wages.
B) some countries do a bad job of educating their work force, consequently they are not very productive.
C) in some countries there is a shortage of capital investment.
D) all of the above are equally important