One commonly used test in checking for the presence of autocorrelation when working with time series data is the ____

Opportunity cost always arises when a trade-off decision is made

a. True b. False Indicate whether the statement is true or false

The Laffer curve suggests that if tax rates get too _____, the government's tax revenues will _____.

A. high; fall B. high; rise C. low; fall D. low; rise