pump priming

A certain amount of Keynesian pump-priming, of the right sort, won't do any harm—but it probably won-t do much good either.

A certain amount of Keynesian pump-priming, of the right sort, won't do any harm - but it probably won't do much good either.

I don't think Mr. Roosevelt's pump priming will do much good because you must keep adding to it or it will go away.