During my recent trip to Shanghai, I noticed that chinese retail shops (clothing, convenience, supermarket, pretty much all shops) employed a large number of shop girls/ greeters. Even at the airport duty free shops there were a dozen greeters to every store. Shanghai seemed to have a greater number of greeters compared to other asian cities I visited- Seoul, HK, and Taipei. How much do these greeters in Shanghai (usually female) make? I ask about wage because I can't imagine commercial rent or other overhead charges are cheap.

In the US, retail workers are typically students working part time. Is it the same throughout Shanghai and Asia?