As for jobs overall, in 2010 the Federal Reserve Bank of San Francisco concluded “there is no evidence that immigrants crowd out U.S.-born workers in either the short or long run.” It also found that the long run effect on the income of Americans is small but positive.

And let’s ask this question. If more people, even people with skills such as those on H-1B visas, are bad for an economy, why is the high-growth state of Texas working overtime to get people from other parts of the country to move there? Under the Walker-Sessions model, shouldn’t that depress wages and take jobs from those already there?

Economists call this the lump of labor fallacy, which holds that the amount of available work is fixed. If one person gets a job, another loses it. But the addition of new workers into a market, especially skilled workers, can increase the productivity of companies in a way that expands the supply of work for everybody.