13 black economy

black economy
unofficial system of employing and paying workers without observing legal requirements such as the payment of income tax 黑市经营(对工人雇用及付酬不遵守缴纳所得税等法规的做法)
    The growing black economy is beginning to worry the Government. 黑市经营日益泛滥, 政府已开始担忧.