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Which of the following is a problem faced by macroeconomists in testing alternative macroeconomic theories? A

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Which of the following is a problem faced by macroeconomists in testing alternative macroeconomic theories?

A. Not knowing whether the model taken to be the true model is actually the true model when testing the rational expectations assumption.

B. The amount of data available is small.

C. Macroeconomic models differ in ways that are hard to standardize.

D. All of the above.