The share of public spending in national income rose rapidly in today’s industrialized countries, from below 10% on average at the end of the nineteenth century to more than 20% just before World War II. And, in the wake of WWII, most countries erected elaborate social-welfare states in which the public sector expanded to more than 40% of national income on average.&#160;
&#160;&#160;&#160; 当今工业化国家中公共开支在国民收入中的比例快速上升，从十九世纪末的平均百分之十不到上升到二次大战前的百分之二十以上。二战结束后，大多数国家建立了精密的社会福利。在这些国家中，公共部门扩大到国民收入的平均百分之四十以上。