In short, for everyone engaged in scientific discourse, statements must be subject to validation by methods and criteria which are, in principle, not subject to partisanship, whatever their ideological consequences, and however motivated. Statements not subject to such validation may nevertheless be important and valuable, but belong to a different order of discourse. They pose extremely interesting and difficult philosophical problems, especially when they are clearly in some sense descriptive (for example, in representative art or criticism 'about' some specific creative work or artist), but cannot be considered here. Nor can we here consider statements of the logico-mathematical type, insofar as they are not (as in theoretical physics) linked to validation by evidence.

Look at London. Of course it matters to all of us that London's economy flourishes. But the test of the enormous wealth generated in patches of the capital is not that it contributed 20%-30% to Britain's GDP but how it affects the lives of the millions who live and work there. What kind of lives are available to them? Can they afford to live there? If they can't, it is not compensation that London is also a paradise for the ultra-rich. Can they get decently paid jobs or jobs at all? If they can't, don't brag about all those Michelin-starred restaurants and their self-dramatising chefs. Or schooling for children? Inadequate schools are not offset by the fact that London universities could field a football team of Nobel prize winners.

The fundamental fact about Britain in the first two generations of the Industrial Revolution was, that the comfortable and rich classes accumulated income so fast and in such vast quantities as to exceed all available possibilities of spending and investment.

Most observers in the 1870s would have been far more impressed by its linearity. In material terms, in terms of knowledge and the capacity to transform nature it seemed so patent that change meant advance that history – at all events modern history – seemed to equal progress. Progress was measured by the ever rising curve of whatever could be measured, or what men chose to measure. Continuous improvement, even of those things which clearly still required it, was guaranteed by historical experience. It seemed hardly credible that little more than three centuries ago intelligent Europeans had regarded the agriculture, military techniques and even the medicine of the ancient Romans as the model for their own, that a bare two centuries ago there could be a serious debate about whether the moderns could ever surpass the achievement of the ancients, and that at the end of the eighteenth century experts could have doubted whether the population of Britain was increasing.

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The art most significantly affected by radio was music, since it was abolished the acoustic or mechanical limitations on the range of sounds. Music, the last of the arts to break out of the bodily prison that confines oral communication, had already entered the era of mechanical production before 1914 with the gramophone, although this was hardly yet within reach of the masses

Liberalism was failing. If I'd been German and not a Jew, I could see I might have become a Nazi, a German nationalist. I could see how they'd become passionate about saving the nation. It was a time when you didn't believe there was a future unless the world was fundamentally transformed.

Except perhaps for such irreducible sexual groups as parents and their children, the ‘man’ of classical liberalism (whose literary symbol was Robinson Crusoe) was a social animal only insofar as he co-existed in large numbers. Social aims were therefore the arithmetical sum of individual aims. Happiness (a term which caused its definers almost as much trouble as its pursuers) was each individual’s supreme object; the greatest happiness of the greatest number, was plainly the aim of society.

These and many other attempts to replace history by myth and invention are not merely bad intellectual jokes. After all, they can determine what goes into schoolbooks, as the Japanese authorities knew, when they insisted on a sanitized version of the Japanese war in China for use in Japanese classrooms. Myth and invention are essential to the politics of identity by which groups of people today, defining themselves by ethnicity, religion or the past or present borders of states, try to find some certainty in an uncertain and shaking world by saying, 'We are different from and better than the Others.'

In short, the analysis of modes of production must be based on study of the available material forces of production: study, that is, both of technology and its organization, and of economics. For let us not forget that in the same Preface whose later passage is so often quoted, Marx argued that political economy was the anatomy of civil society. Nevertheless, in one respect the traditional analysis of mops and their transformation must be developed - and recent Marxist work has, in fact, done so. The actual transformation of one mode into another has often been seen in causal and unilinear terms: within each mode, it is argued, there is a 'basic contradiction' which generates the dynamic and the forces that will lead to its transformation. It is far from clear that this is Marx's own view - except for capitalism - and it certainly leads to great difficulties and endless debates, particularly in connection with the passage from Western feudalism to capitalism.

Having established the limits beyond which partisanship ceases to be scientifically legitimate, let me argue the case in favour of legitimate partisanship, both from the point of view of the scientific or scholarly discipline and from that of the cause to which the scholar feels committed.

In 1831 Victor Hugo had written that he already heard 'the full sound of revolution, still deep down in the earth, pushing out under the kingdom in Europe to its subterranean galleries from the central shaft of the mine which is Paris. 1847 the sound was loud and close. In 1848 the explosion burst.

To draw a parallelism between the arts and the sciences is always dangerous, for the relationships between either and the society in which they flourish is quite different. Yet the sciences too in their way reflected the dual revolution, partly because it made specific new demands on them, partly because it opened new possibilities for them and faced them with new problems, partly because its very existence suggested new patterns of thought.

My argument implies that, divorced from history, economics is a rudderless ship and economists without history have not much idea of where it is sailing to. But I am not suggesting that these defects can be remedied simply be getting some charts, that is by paying more attention to concrete economic realities and historical experience. As a matter of fact, there have always been plenty of economists ready and anxious to keep their eyes open. The trouble is that, if in the mainstream tradition, their theory and method as such has not helped them to know where to look and what to look for.