I include this table in each edition of my Principles of Economics text (and if you're teaching an intro econ course, I encourage you to check it out). Here are some lessons try to highlight:
First, the bulk of world trade involves high-income areas of the world, either as exporters, importers, or both. For example, the single biggest number is the $4,382 billion that countries in Europe sell to each other. The level of trade between North American countries appears low compared to Europe, but this is because the European Union includes 27 nations while the trade
in the North American region is between the United States, Canada, and Mexico. Remember,
exports from Germany to Sweden count as international trade, but sales from California to New York would not be counted in this table, since they occur within the U.S. economy.
Second, trade between high-income regions and low-income regions is fairly extensive. Perhaps the most vivid example of this point is trade of $3,012 billion between the nations of Asia. Asia includes the high-income economies like Japan and Korea, upper-middle income countries like China and Thailand, lower-middle-income countries like Indonesia and Vietnam, and low-income countries like Cambodia.
Third, high-income regions are important as markets to the other regions. The countries of Africa, for example, export more than three times as much to the European Union as they do to other countries of Africa. As noted above, countries of Latin America almost as much to North America than they do to each other.
Finally, trade between some regions is very low; for example, between Africa and Latin America, or between the Middle East and the Commonwealth of Independent States. Indeed, some regions of the world seem economically disconnected from each other. I suspect that in a globalizing world economy, these connections will be gradually created and growing over time.