The main explanation is not considered here: Automation and Outsourcing.<p>Both reduce the demand for local human labor, and thus depress wages. They cause wealth redistribution upwards by providing a power imbalance between the capitalist and the worker.<p>David Harvey did a nice talk about this: <a href="http:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=qOP2V_np2c0" rel="nofollow">http:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=qOP2V_np2c0</a>