以下是我的理解: For tax evasion to force a raise in income tax rates it must be true that tax evasion causes actual tax revenues to fall short of revenue needs. 可见,恶性循环的前提是tax evasion causes actual tax revenues to fall short of revenue needs,即tax evasion要比tax revenues更多, 才导致恶性循环. 所以恶性循环无效的前提就是tax revenues要比tax evasion更多. 这个前提也是C选项"when lawmakeers establish income tax rates in order to generate a certain level of revenue, they do not allow adequately for revenue that will be lost through evasion"所说. E选项取非:即使是HEAVIER RATES, 也不一定导致更多的人逃税;逃税的人数不增加不能保证tax evasion的总额不增加,可能逃税的人隐瞒了更多的收入.导致tax evasion要比tax revenues更多,导致恶性循环,即又force a raise in income tax rates in order to generate a certain level of revenue. |