"Yet the more Frank got to know his fiefdom, the more he began to doubt the wisdom of expelling or starving nearly one in ten of the population, to say nothing of the dangers of allowing epidemics to break out in the principal cities. In the early 1930s, Jews had accounted for nearly half of Poland's highest income-earners. A very high proportion of the entrepreneurs, managers and skilled workers of Polish cities were Jewish. One of the first acts of the German occupation had been to authorize the seizure of all Jewish property - the beginning of a campaign of systematic and ruthless plunder. At around the same time Frank had issued an edict imposing a general obligation for forced labour on all male Jews between the ages of twelve and sixty. Whether for their capital or their labour, Jews had an unquestionable economic value; simply stealing the former and eliminating the latter was patently not a profit-maximizing strategy. Unless Frank wanted to return the Polish economy to the Middle Ages, he needed to work out a compromise between the dictates of racist ideology and the economics of empire."