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However, in the slump the level of concentration will rise as more and more firms go to the wall or try and merge to survive (for example, there were 100 car producers in the USA in 1929, ten years later there were only three). So our basic point is not dependent on any specific tendency of the degree of monopoly. It can fall somewhat as, say, five large firms come to dominate a market rather than, say, three over a period of a few years.