stacyherbert says: August 23, 2012 at 8:45 pm @Bob Robertson ??? you write, ???externalities that are coercive can be dealt with just as any other coercive action, by defenses such as fences, or adjudication??? ??? ??? tell that to the natives in South America or the tens of thousands of Chinese who riot every year due to poisons dumped into their water table by mostly US taxpayer backed corporati