Question 28 In the diagram below of a closed economy, what could have caused the economy to move from a to b? Not yet Inflation nswered (%) Marked out of .5 10 Flag 9 LRAS SRAS question 8 7 - 6 - 5 4 - 3 2 - AD 1 AD* 0 5 6 7 8 9 10 Unemployment (%) Select one: O a. either fiscal or monetary contraction O b. a wave of optimism O C. a decrease in price O d. an increase in the price of oil