Originally the massive manufacturing industry was accelerated by the large amount of people from rural areas flocking into the city due to reform and opportunities. The increase in population resulted in a large unskilled workforce and thus very cheap manual labour and large factory assembly lines.
It's a lot better now given a much more competitive market. Salaries are higher and quality of living is better than the rest of the country. A lot of people became very rich in Shenzhen within the last decade.
Another option is to open an international account link with HSBC so that you can ping money from the US to China quickly, then pay out locally. However foreign banks including HSBC have strict rules on what they are allowed to do in country so you may need to do a bit more shuffling to make this route happen.
Recommended domestic bank (Shenzhen based) is China Merchant's Bank.
> Prices Including Rent in Shenzhen are 36.96% lower than in Los Angeles.
> Prices Including Rent in Los Angeles, CA are 36.34% lower than in Zurich.
Not sure the solve for this, just found it interesting.