Under capitalism, one is immoral if one reneges on a contract or breaks the law, but not if one speculates. Planned economies were never able to flourish because uncertainty about the future is just too high, something that is best left to the speculators, with the potential of reward if they are right and the disciplining whip of the market if they are wrong.
在资本主义制度下，不履行合同或违反法律的行为是不道德的，但投机却不是。计划经济从未能繁荣就是因为关于未来的不确定风险太高。而不确定因素最好留给投机者，给他们机会在顺应市场规律时获得回报，在违反规则时受到市场惩罚。