Looking for another sign of a weakened China economy? Try the rent-a-foreigner marketReporting from Beijing — To take stock of the Chinese economy, you can look at any number of traditional measures: Gross domestic product is growing at a slower pace, the equity markets are plunging, the currency’s value is ebbing. And now there’s another indicator of change: The rent-a-foreigner market appears to be weakening, and going downscale. Just a few years ago, foreigners who came to Chi
