Only the short-run phillips curve is downward sloping because: a in the long run, prices adjust, eliminating the relationship between inflation and unemployment. b central banks only have influence over the economy in the long run. c central banks have no influence over the economy in the short run. d in the long run, prices are sticky, eliminating the relationship between inflation and unemployment. e long-run effects of monetary policy are negated by fiscal policy.

a in the long run, prices adjust, eliminating the relationship between inflation and unemployment

Explanation:

Philip's curve states that there is an inverse relationship between inflation and unemployment in the short run. However, in the long run, workers and consumers adapt to the new environment.

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy