Historical evidence shows that for determining a country's living standards, over: long periods, it is difficult to determine whether the business cycle or long-run growth is more important. a. an extended period, long-run growth is much more important than the business cycle. b. an extended period, long-run growth is just as important as the business cycle. c. short periods, long-run growth is less important than the business cycle.d. long periods, it is difficult to determine whether the business cycle or long-run growth is more important.