The flipside: with a healthy workforce, the ability of developing countries to provide for themselves increases. There are many success stories (saw this on 'Jimmy's Farm' last year, where you have African farmers producing crops for western consumption (at times of year where we cannot produce said items or the costs would be prohibitive). Leaving aside arguments for and against 'food miles', Africa needs a healthy population in order to supply this Market.
The greater the trade with the west, the more African countries earn in exports, the stronger their currency, the stronger their currency, the better their position to trade,
But it all comes down to manpower.