>> Just wait, the gradient of average GDP increase (in real terms) has been
>> a steady doubling every 15 years since about 1850, and has shown no
>> signs of slowing.
>
> Meanwhile, the income gap has increased by more than that, and also shows
> no signs of changing.  So the rich get richer, the poor get poorer, and
> upward mobility is stifled.

Any evidence for that comment? Even in the last 40 years the poor have 
not been getting poorer:

http://rs.resalliance.org/wp-content/uploads/2009/10/worldincome1970_2006.jpg

Another chart here, global poverty has reduced from about 90% of the 
population in 1800 to just above 20% by 2000.

http://blog.compassion.com/wp-content/uploads/2009/10/Global-Poverty-1820-1992_graph-1.jpg

That's quite some progress, especially given the world population also 
increased by a factor of about 6 in the same time period.

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