The Trilemma in History: Tradeoffs Among Exchange Rates, Monetary Policies, and Capital Mobility
用新方法分析长期历史数据，检验经典三难困境（汇率稳定、货币政策独立、资本自由流动不可兼得）是否成立，对理解不同汇率制度下的政策自主性有参考价值。
Recently, the political economy of macroeconomic policy choice has increasingly been guided by the simple prescriptions of the classic trilemma. For example, policymakers often speak of the hollowing out of exchange rate regimes in a world of unstoppable capital mobility; and policy autonomy and a fixed nominal anchor present an unpleasant dichotomy for emerging markets beset by the fear of floating. Yet the trilemma is not an uncontroversial maxim, and its empirical foundations deserve greater attention. Some authors (e.g., Calvo and Reinhart 2001, 2002) have argued that under the modern float there could be limited policy autonomy given the rapid international transmission of interest rate shocks; others (e.g., Bordo and Flandreau 2003) that even under the classical gold standard there actually was considerable policy autonomy given the gold point spread and the use of gold devices and other tricks. Such arguments turn the trilemma on its head. Resolving this debate is ultimately an empirical matter, where the broadest span of data should be scrutinized. Using new techniques to study the coherence of international interest