On comparative advantage, and companies taking Silicon Valley funding

Was setting out to write a post about how startups outside Silicon Valley could model the process of moving to the Valley as an outcome of comparative advantage, and was thoroughly sidetracked into reading Paul Krugman on how non economists don't, and usually don't want to, understand what economists mean by comparative advantage.

Anyway, "take Ricardo’s original comparative-advantage example, in which unit labor requirements look like this:

-----------Cloth Wine
Britain 100 110
Portugal 90 80

Ricardo famously argued that in this case there can be mutual gains from trade.