As the 17th-century poet John Donne wrote in those immortal lines, “No man is an island, entire of itself; every man is a piece of the continent, a part of the main.”

Don’t be alarmed. This is not a column about poetry, or metaphysics, but about how the world economy has churned and woven its way, however unsteadily, toward closer and closer ties between different countries and regions, and thus toward greater integration overall. These processes are generally called globalization, lending to a sense that this is something relatively new, but in fact, it has been going on in one form or another for centuries. ...