In the calculation of gross domestic product by the expenditure approach, the "investment" component is

Which of the following is correct? i. U.S. total surplus decreases when the United States exports a good. ii. U.S. total surplus decreases when the United States imports a good. iii. U.S

total surplus increases when the United States imports a good and when it exports a good. A) i only B) iii only C) i and ii D) ii only E) None of the above because the U.S. total surplus does not change as a result of trade

Economists in different areas are on the lookout for "natural experiments" that can help provide strong evidence on a subject. An example of such a natural experiment

A) Exists in the case of the split between East and West Germany after World War II and how this provides evidence on the importance of protective institutions B) Exists in the case of the adoption of new technologies like the rail engine after 1850 and how it provides evidence of the importance of technology C) Exists in the case of the trade between states like Washington and Florida and how it provides evidence on the value of trade D) Exists in the case of the case of the U.S. and Mexico given their location in North America