"History, politics, sociology, psychology and anthropology are suggestive, not conclusive, disciplines: they cannot prove (or more importantly disprove) any hypothesis. Economics should aim to be more like them and less like physics and maths. That is why I was drawn to Keynes: he was a man of many parts. I have heard economists say he was a brilliant thinker, but a bad theorist. They objected to his 'ad hoc' theorizing - inventing bits of theory to explain unusual events, rather than building up his theory from secure micro-foundations. His wife called him 'more than an economist'. I am less than an economist, but perhaps this makes me better able to appreciate his greatness."