The important thing for Government is not to do things which individuals are doing already, and to do them a little better or a little worse; but to do those things which at present are not done at all.
The answer is after the jump.
Answer: John Maynard Keynes.
(Which does, incidentally, make me wonder how many people who now call themselves Keynesians really are. Many on the left outside the Liberal Democrats, certainly, view such attitudes to the role of the state – when expressed by 21st century politicians – as something to abhor. But in that respect, Keynes is rather like William Beveridge, whose views on benefits does not sit comfortably with many on the left who like to invoke his name with pride.)