The economist Barry Eichengreen once explored the imposition of capital levies in the aftermath of World Wars I and II. He found that, owing to capital flight and political pressure for delay, the results were often disappointing.
首先，来自临时性财富税的收入可能难以计算。经济学家巴里·艾肯格林（Barry Eichengreen）曾探索过两次世界大战后资本税的构成。他发现，由于资本外逃和推迟执行的政治压力，结果通常令人失望。