answer:First things first: barter and capitalism are not mutually exclusive, so the extended discussion of a total barter system doesn’t really help you out at all here. In any case, most of the people who decry capitalism do have something that they propose replacing it with. And I’m sure if you asked them, they’d tell you that they think their proposed replacement is better than the existing system. You also seem to assume that all arguments against capitalism are predicated on complete and total opposition to all of its principles, but this is plainly false. There are plenty of people who support mixed economy systems as an alternative to laissez-faire capitalism. For them, the problem with capitalism is found not in its basic principles, but in the excesses and abuses that come along for the ride. In fact, Adam Smith—the so-called “father of economics”—was himself skeptical of the laissez-faire approach. But even if you were correct that the opponents of capitalism had nothing to replace it with, that wouldn’t mean it was pointless for them to point out the problems with the current system. Very few changes of great magnitude are the result of a single individual diagnosing the problem, coming up with a solution, and implementing the new system all on their own. Sometimes you have to get enough people to recognize that there is a problem before you can even start to work on a solution.