A work of genius is a complex object and there is light to be shed about what went into the making of it. Even in the case of scientific and mathematical achievement we can say a great deal about the existing state of knowledge, the problems it failed to address, why those problems were or had become interesting, the particular capacities which the solver brought to their solution. At the other extreme is a work of art which seems to have much more immediate roots in the personal life of the artist or writer. In between is the area in which Keynes worked, which was partly scientific, partly artistic. This gives a wide justification for a biographical approach. As I put it in the introduction to my first volume: 'If underlying Keynesian theory was Keynes's vision of his age, knowledge of his state of mind and the circumstances which formed it is essential, not only in order to understand how he came to see the world as he did, but also in order to pass judgement on the theory itself.'

Keynes displayed an awesome array of talents, without being preeminent in any. He was not a genius in the sense of being a Divine Fool as was Mozart or Wittgenstein ― extraordinary at one thing, babyish in everything else. He was a wonderful all-rounder, with a superbly efficient thinking machine. At Eton he had excelled at mathematics and classics, and throughout his life he effortlessly bridged the two cultures. He was not a remarkable mathematician. Nor was he a great philosopher. As a historian he was an inspired amateur. He had a theory of politics, but it never saved him from the charge of being politically naive. Keynes was great in the combination of his gifts. His achievement was to align economics with changes taking place in ethics, in culture, in politics and in society ― in a word, with the twentieth-century spirit. But, like Jevons, his qualities never quite jelled. That, rather than too great a haste, is why he failed to produce a work of art, although his writings are full of artistry. His best stylistic achievements were in his shorter pieces ― notably his biographical essays. In his big books he was the pamphleteer trying to rein in his imagination, school himself to the demands of a formal treatise. He had powerful intuitions of logical and historical relationships, but was not at his happiest in sustained argument. Like Marshall, his concentration came in short bursts. His temperament was too restless, his mind too constantly active, and bursting out with ideas and plans, for thinking in solitude.

The General Theory of Employment, Interest and Money is a work of enduring fascination. It is simple and subtle, obscure and profound. It offered a systematic way of thinking not just about the behaviour of contemporary economies, but about the pitfalls in the quest for greater wealth at all times. It combined a vision of the future with a rigorous demonstration of the possibility of underemployment equilibrium. Although young economists of speculative bent were drawn to it as a storehouse of suggestive ideas, it was its practical usefulness which chiefly attracted them in a world poised between decaying democracy and rampaging dictatorship.
At its core is a 'theory of output and employment as a whole', to distinguish it from the orthodox theory of what causes 'the rewards and distribution between different uses of a given quantity of resources' to be what they are. Keynes was the first economist to visualise the economy as an aggregate quantity of output resulting from an aggregate stream of expenditure. This new way of seeing the architecture of an economy is the General Theory's most enduring legacy.

Keynes had a political objective. Unless governments took steps to stabilize market economies at full employment, much of the undoubted benefit of markets would be lost and political space would be opened up for extremists who would offer to solve the economic problem by abolishing markets, peace and liberty. This in a nutshell was the Keynesian 'political economy'. Keynes offers an immensely fruitful way of making sense of the slump now in progress, for suggesting policies to get us out of the slump, for ensuring, as far as is humanly possible, that we don't continue to fall into pits like the present one, and for understanding the human condition. These are the things which make Keynes fresh today.

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Keynes was one of those rare persons who can both think and act at the highest level. His life falls into cycles or phases, in which the emphasis shifts from one to the other. These shifts were related to what was happening in the world. At some times, particularly during the two world wars, there was a greater demand for Keynes's practical genius, and a greater satisfaction to be had from exercising it. But the cycles can also be seen in terms of action and reaction. Periods of great intellectual effort demand their release in practical activity, while practical activity prompts, sooner or later, a yearning for the cloister. Before 1914, Keynes's desire for the cloister was uppermost, partly because he was at this period most under the immediate influence of Moore's philosophy, partly because the nature of his sexual relations fitted private life better than public life ― a point of considerable importance even today, but more so then, when homosexual acts were illegal, and the danger of blackmail much greater.

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The reason why economics has given such a poor account of the origins of the crisis is that there is something essentially incompatible between the economist's view of individual rationality and systemic collapse. Without adding qualifications which strain their logic, economists cannot readily get from their picture of the the individual maximizing his utilities to booms and slumps and the persistence of depressions.

Having said this, it is easy to see that he might have been deluding himself. He envisaged a modern capitalist economy governed by a Platonic ideal, and gentlemanly codes of behaviour. But once the capitalist genie is let out of the bottle it cannot be pressed into the service of a pre-modern ethics of the good life and pre-modern codes of behaviour. The good life in the classical sense presupposes that human desire has some ultimate end, or telos, whereas modern economic theory and life presuppose that it is insatiable. As regards behaviour, he took for granted a class-based system of values which economic progress was undermining. These were contradictions which Keynes never fully faced.

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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.

The Economic Consequences of the Peace has a claim to be regarded as Keynes's best book. In none of his others did he succeed so well in bringing all his gifts to bear on the subject in hand. Although the heart of the book was a lucid account of the reparation problem, the book was no mere technical treatise. The torrid mise-en-scène at Paris is vividly recreated; the failings of Clemenceau, Wilson and Lloyd George are displayed with cruel precision. The writing is angry, scornful and, rarely for Keynes, passionate: never again were his denunciations of bungling and lying, or his moral indignation, to ring so loud and clear. Giving shape to the whole is a brooding sense of menace; a sense of the impending downfall of a civilisation; of the mindless mob waiting to usurp the collapsing inheritance; of the futility and frivolity of statesmanship. The result is a personal statement unique in twentieth-century literature. Keynes was staking the claim of the economist to be Prince. All other forms of rule were bankrupt. The economist's vision of welfare, conjoined to a new standard of technical excellence, were the last barriers to chaos, madness and retrogression.

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Through Marshall's life and work the Victorian demand for authoritative social doctrine found one of its most important expressions in the Cambridge School of Economics. Maynard Keynes's relationship to that tradition is one of the central themes of this biography. That relationship was never unproblematic, because Marshall's achievement was incomplete. He had shown how the existing moral code could be made to serve society rather than God. But there was nothing in his work to show how it could be altered so as to make it possible for individuals to lead happier or more civilised lives. Marshall himself seems not to have felt any pressure to do so. But Sidgwick had, as had many other thinking Victorians. It was the reorganisation of personal life rather than the reorganisation of society which seemed the urgent problem for the next generation, especially once the soc ail and economic clouds of the 1880s and 1890s had given way to the bright sunlight of the Edwardian age.