[coldtea]

>Capitalism is stronger than customs.

What you describe below, besides inaccurate (lots of very efficient food sources never made much dent to other cultures, potatoes are more of an exception than an example), is not capitalism, but hunger.

In a famine people will even eat rats (or fellow men).

That's not really about capitalism. It worked that way under every kind of economic system, including ones predating capitalism by milenia.

[nate_meurer]

Not sure what your point is. Production of products that solve our hunger problems (i.e., food) are driven by market forces to some extent regardless of economic system. Just because the same forces apply when the state controls the means of production, for example, doesn't make the OP any less accurate.

And exactly which economic systems predate capitalism by milenia?