When you buy a pair of pants, of, say $100, what do you think the person (presumably in China or India) who manufactured it receives? Right, less than $1.
However before the pants factory (and others) were allowed by the PRC government, hundreds of millions of Chinese were making under $1 per DAY who now are making more than that. So even making a few dollars per day is a big step up for them.
By the way, for the quarter ending Aug. 25, 2013 Levi Strauss reported a profit of $57.1 million on revenues of $1.14 billion, for a profit margin of 5%. There is a lot that goes into selling a pair of pants for $100: marketing, transport & distribution, planning, research, etc.
Your jeans may be made from cotton grown in Uzbekistan, Azerbaijan, or Turkey, woven and dyed in Italy, cut in India, then go to one of 35 countries for assembly. Not just China, but also Bangladesh, Cambodia, Dominican Republic, and Sri Lanka.