Short answer: leverage. The greater the leverage the more production can be multiplied and thus income. Some things that have amplified leverage are: 1) Acce

Short answer: leverage. The greater the leverage the more production can be multiplied and thus income. Some things that have amplified leverage are: 1) Access to a larger talent pool (globalization) 2) More educated people 3) The Internet 4) Access to financial capital and financial instruments 5) Access to foreign labor that is cheaper