It is the surplus value created out of the products made from cheap labour that allows wealthier Chinese to increase demand in higher value goods that we produce.
At the moment we have huge areas of the globe where we have unmet need for goods. This demand can not be met because the people can not afford to purchase the goods of their own labour. At the moment capitalist try and fail to meet the unmet need by driving down the cost of products through the supression of wages.
One way the capitalist tries to make money and meet unmet demand in new markets is to drive down the value of the commodity, as we see in china and with corporations basing manufacturing in areas of deregulated cheap labour. The amount of value in a commodity over and above the wages paid to the worker is surplus value, all of which is created by labor, but stolen by the owner of the means of production, the capitalist, as the source of profit.
At the moment it is this profit which allows rich chinese factory owners to purchase BMWs.
With capital striving for higher profits from the stolen surplus value, labor is in perpetual battle against capitals unrelenting drive to lower wages below a living wage. These wages are a monetary expression of the cost of labor power. Labor power is the worker, source of potential or actual labor power Thus the cost of labor power is the cost of maintaining a worker and his or her family, and capitalism as a system locks the worker onto a treadmill of poverty or the threat of poverty in order to meet the unmet need in commodities, or rather to meet or stimulate the demand.(from poorly paid people!!)
So if we as a nation continue to devalue our labour under capitalism in order to meet the unmet need of chinese workers , should they ever meet the threshold through which they can create demand in commodities!!!!! it becomes a race to the bottom. Where we all work for less, create less demand in the economy OR the capitalist strikes a deal for fair wages, which he can't. Which is why I believe the answer is not simply a matter of demanding higher wages.
"labour is a commodity, if the price is low, then the commodity is in great supply: the price of labour as a commodity must fall lower and lower. (Buret, op. cit.) This is made inevitable partly by the competition between capitalist and worker, partly by the competition amongst the workers Marx not just for work but for the very products of their labour!
Wages are not the problem the system by which the owners/wealthy create profit through exploiting the labour of others is the cause of the problem.