http://english.vietnamnet.vn/biz/2006/09/608264/

"Worker salaries hit the glass ceiling at $163 per month in Hanoi and $185 in Ho Chi Minh City. These figures are $301 and $249 in Shanghai and ShenZhen respectively, according to the MPI. An engineer’s salary is around $385 in Hanoi and $373 in Ho Chi Minh City, compared to $593 in Shanghai and $620 in ShenZhen."