Barbed 1" Adapter (BxS)

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This is a great comment, but I'd add that it's not a one-way rehtsionalip between law/security and ecology. Europe may well have developed quasi-pastoralism because they enforced property rights in land, and the nomads of Africa not because they didn't, more than vice versa.In the American livestock-and-fencing rule case I can buy that the causation went largely from ecology to law. They had an abundance of cheap or free wild lands on which to feed livestock. Americans also partially regressed from horses to oxen as draft animals, after several centuries of an English move from oxen to horses, since oxen can be more easily fed on wild lands whereas good draft horse work generally requires fodder.There may also be transport costs and comparative advantage at work. If you're far away from navigable water, and so can't afford to transport your grain to market, cattle, which can be driven over a much larger distance, have a comparable advantage. So an efficient rule would favor the dominant industry in these areas. Even if conditions change, for example the coming of a railroad that makes grain growing competitive, once the rule is in place, roving pastoralism (and the associated pathologies) can be locked in until cheap fencing becomes available. However, I'd bet that near the railroads grain farming would have won out anyway, and they would have figured out creative ways to secure their farms (ditches, hedges, stone fences, etc.) The British didn't have barbed wire but enclosed their livestock (under the reverse rule) just fine.