The problem with the market is its not so smoothly distributed. You can barely, almost, sometimes buy commodities at a worldwide price in most places, but certainly cannot earn the same everywhere. The median for Africa is about $2K not $10K so making the huge assumption that poverty stricken economies only involve food, thats still ten or so pounds of rice per day, which is pretty marginal as a sole long term food source for an entire household.

Thats the problem with "homo economicus" the market is very small and will not offer certain things, the Belgian lawyer in the example simply won't be offered a part time job by the market, no matter if the demand exists or not.

If you don't really have a market, market speak and market analysis don't lead to useful places.