THERE is a peculiar paradox at the centre of capitalism. Since it is a system that institutes free mobility of workers between sectors, real wage rates should be equalised across occupations which are not too dissimilar from one another in terms of their arduousness, or hazardousness, or unpleasantness, or skill requirements, or intensity of effort etc. In other words, more arduous, more hazardous and more unpleasant jobs should be better paid compared to less arduous, less hazardous or less unpleasant ones, other things being equal (i.e., per unit of homogeneous labour-time).