The Quick Take: Rapid oil and gas development in the “oil patch” of western North Dakota and northeastern Montana has created huge demand for workers—not just in the oilfields, but also in a range of non-oil industries. But so far, the supply of labor—from within and outside the region—has responded slowly to demand. In recent years, job openings have soared and unemployment has dropped to very low levels—below 3 percent in a number of counties. The Bakken oil play is drawing job seekers from other Ninth District states and the rest of the country, but they’re not coming in sufficient...