What are the potential impacts of adding too much fuel to the economy?

nnWilliam McChesney Martin, who served as Chairman of the Federal Reserve in the 1950s and 1960s, is famous for saying that central banks should “take away the punch bowl just as the party is heating up”.nnWhat does this saying mean? Why wouldn’t we want the “party” to get too exciting? What are the potential impacts of adding too much fuel to the economy?nn