In 2006, several members of Congress argued for eliminating most of the tax reductions that had been enacted during the previous five years. However, virtually no one was in favor of eliminating the “child tax credit,” which cut the taxes of most families by $ 1,000 per child. One economist argued that keeping the child tax credit “might be good for social purposes, but there’s no economic case for it” [Ip, 2006]. Explain what this economist meant using the concept of excess burden.