在我们的现实生活中 ,“地下经济”现象随处可见 :一个白天在工厂做工的工人夜里开“黑车”挣点外快 ;一个管子工给一个客户修理水管 ,他把客户支付的现金揣进兜里 ,而没有向税务部门申报这笔收入 ;一个毒品贩子通过贩卖毒品赚了大把钞票。这类在官方的统计账册上没有任何记录 In our real life, the phenomenon of “underground economy” can be seen everywhere: a worker who works in a factory during the day and night makes a “black car” to earn extra money; a plumber who repairs a pipe to a client and hides his client’s cash in his pocket Instead of declaring the revenue to tax authorities; a drug dealer made a large amount of money by selling drugs. There are no such records in the official statistical books