Politics and Efficiency of Separating Capital and Ordinary Government Budgets*
分析一项将资本与经常性预算分离、仅允许为资本项目举债的规则在民主政治中的效率影响，发现该规则在代际交叠且人口增长的经济中能激励多数人选择高效的公共品组合，并用美国数据解释为何联邦政府放弃而州政府保留该规则。
We analyze the democratic politics of a rule that separates capital and ordinary account budgets and allows the government to issue debt only to finance capital items. Many national governments followed this rule in the 18th and 19th centuries and most US states do so today. Despite its simplicity, this 1800s financing rule provides excellent incentives for majorities to choose an efficient mix of public goods in an economy with a growing population of overlapping generations of long-lived but mortal agents. In a special limiting case of our model where the demographics make Ricardian equivalence prevail, the 1800s rule does nothing to promote efficiency. But when the demographics imply even a moderate departure from Ricardian equivalence, imposing the rule substantially improves the efficiency of democratically chosen allocations. We calibrate some examples to U.S. demographic data and use our findings to offer a tentative explanation for why the 1800s rule was abandoned by the Federal government but not by state governments in the twentieth century