Large-scale migration is another reason prices are falling. Big, rich cities are magnets for immigrants of all professions, including sex workers. Nick Mai of London Metropolitan University has studied foreign sex workers in Britain. He has found that as they integrate and get used to the local cost-of-living, their rates tend to rise. But where the inward flow is unceasing, or where the market was previously very closed, immigrants can push prices down.
Since the European Union enlarged to include poorer eastern European countries, workers of every sort have poured into their richer neighbours. By all accounts prices have been dropping in Germany as a result of the arrival of new, poor migrants, says Rebecca Pates of the University of Leipzig. Sally, a semi-retired British escort who runs a flat in the west of England where a few mature women sell sex, says English girls are struggling to find work: there are too many eastern European ones willing to accept less.
Twenty years ago most prostitutes in Norway were locals who all aimed to charge about the same, says May-Len Skilbrei, a sociologist at Oslo University. Today, with growing numbers of sex workers from the Baltic states and central Europe, as well as Nigerians and Thais, such unofficial price controls are harder to sustain.
