"In fact, economists agree on many things, a number of which are politically controversial. The Harvard economist Greg Mankiw listed some of them in 2009. The following propositions garnered support from at least 90% of economists: import tariffs and quotas reduce general economic welfare; rent controls reduce the supply of housing; floating exchange rates provide an effective international monetary system; the US should not restrict employers from outsourcing work to foreign countries; and fiscal policy stimulates the economy when there is less than full employment."