Here is a map that explains a lot

MAP: Every Country's Highest-Valued Export

Source: Business Insider

The source provides individual maps by continent so that you can see the exports more clearly. Countries that compete in international markets on primary products might be divide into two groups -- the oil/petroleum exporters that can be relatively well off and the rest who are not. The exporters of capital goods, machinery, autos tend to be high income, the exporters of clothing and other older manufactures, not so much.