I don't think it's necessary to make a distinction between a de jure monopoly, say, and a de facto monopoly, or a cartel. The point is a market that allows lot

I don't think it's necessary to make a distinction between a de jure monopoly, say, and a de facto monopoly, or a cartel. The point is a market that allows lots of profit for an extended time period. This doesn't have to produce a Bell Labs, but it sure seems helpful.