Monopólios?

"To those who are still tempted to make the number of pro ducers in any field the test of competitive merit, we might ask (setting aside the problem of proving homogeneity): How can the market create sufficient numbers? If Crusoe exchanges fish for Friday’s lumber on their desert island, are they both benefiting, or are they “bilateral monopolists” exploiting each other and charging each other monopoly prices? But if the State is not justi fied in marching in to arrest Crusoe and/or Friday, how can it be justified in coercing a market where there are obviously many more competitors?" Murray N. Rothbard