Cash is defined as currency in corporate accounts, short term investments or commercial paper that's easily convertible to cash.

现金流通在企业账目中是有明确规定的，一些短期投资或者商业票据很容易兑换成现金。

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In addition to all of these tax issues, the U.S. in the early 1930s was on a gold standard where paper currency was legally convertible into gold.

WSJ: Arthur B. Laffer: Taxes, Depression, and Our Current Troubles