这里的地下经济不是指非法获得的钱财，而是指虽然合法但是不纳税的经济活动。
Shadow economy does not mean ill-gotten gains here, but legal economic activity that is not taxed.
“地下经济”通常被称为非正式经济活动，如果从制度经济学的角度来解释地下经济，那么，它并不是一种完全消极的经济活动。
The"underground economy"is usually termed as informal economic activities, and it is not purely negative as economists assumed from an aspect of institutional economics.
由于交易成本的存在，使人们在进行经济活动时，面临着地上经济还是地下经济的选择。
Because of the transaction costs, while engaging in economic activities people are faced with two alternatives: underground economy or overground economy.
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