Everybody's good at something. Comparative advantage means that there will be something you can do well enough that everyone in the world too is better off if you do it. Go ask your Professor of Economics (and think about the fact that teaching economics is her comparative advantage).
Every community has something that they are so good at; or that is so unique to them; or that, for whatever reason, only they can do - or do well. We want to help communities identify those sustainable comparative advantages - and start exploiting them to increase their incomes and fund their own development.
1 International Fund for Agricultural Development. (2001). Rural Poverty Report. International Fund for Agricultural Development.
2 The World Bank Group. (2008). World Development Report. Washington, D.C.: The World Bank Group.