Russell Roberts of George Mason University writes about Japan, China, and the trade deficit scare in the Wall Street Journal. Along the way he notes:

The story of the baseball off-season is the Red Sox spending $100 million to bring Daisuke Matsuzaka from Japan to the United States. Dice-K, as he’s known, is the ultimate import. He takes away a job from an American pitcher.

Russ is mocking the protectionist argument, of course. But he could have drilled in on this point more than he did. We often hear that immigrants “take American jobs.” But really, when America welcomes software engineers from India or magazine editors from England or the laborers who built my house from El Salvador, they don’t necessarily take anybody’s job. An expanding economy–expanding partly because of the immigrants–may well need more engineers, editors, or laborers than it would have needed in the absence of immigration.

But Dice-K actually is taking someone’s job. He’s going to pitch in the major leagues. There’s a fixed number of major league teams, and pretty much a fixed number of pitchers on each team. If the Red Sox hire Dice-K, they’re going to fire or not hire some other pitcher. Probably some good ol’ boy from the American South, whose next best alternative is, yes, being a greeter at Wal-mart. Maybe even one of my Kentucky relatives. Hey, maybe Pat Buchanan’s onto something here…