What is the extent of currency diversification in the international monetary system? How has it evolved over time? In this paper, we quantify the degree of currency diversification using regression methods of currency co-movements to determine the extent to which national currencies across the world belong to a reserve currency bloc. We then use these estimates to calculate the economic size of each currency bloc. A key contribution of our paper is that we quantify the size of the Chinese renminbi bloc. Our analysis suggests that the international monetary system has transitioned from a bi-polar system - consisting of the U.S. dollar and the euro - to a tri-polar one that includes the renminbi. The dollar bloc is estimated to continue to dominate, having the largest share in global GDP (40 percent), followed by the renminbi (30 percent) and the euro blocs (20 percent). The geographical area of influence for the RMB bloc appears to be most evident among the BRICS’ currencies. The British pound and the Japanese yen blocs appear to play minor roles.

The IMF Working Papers series is designed to make IMF staff research available to a wide audience. Almost 300 Working Papers are released each year, covering a wide range of theoretical and analytical topics, including balance of payments, monetary and fiscal issues, global liquidity, and national and international economic developments.

China’s exchange rate regime has undergone gradual reform since the move away from a fixed exchange rate in 2005. The renminbi has become more flexible over time but is still carefully managed, and depth and liquidity in the onshore FX market is relatively low compared to other countries with de jure floating currencies. Allowing a greater role for market forces within the existing regime, and greater two-way flexibility of the exchange rate, are important steps to build on the progress already made. This should be complemented by further steps to develop the FX market, improve FX risk management, and modernize the monetary policy framework.

The role of the Japanese yen as an international currency is assessed. It is found that the determinants of international-currency use imply some increase for the yen’s use in international finance; however, the implications for the yen’s use in international trade are mixed. It is also shown that, despite Japan’s emergence as the world’s largest net creditor nation, Japan’s capital outflows have not significantly facilitated the yen’s internationalization. Data are presented showing that, although the yen’s use as an international currency has increased, it is still rather modest. Wider use of the yen as a regional currency in Asia has occurred, though a “yen-zone” does not appear to be emerging.

The next financial collapse will resemble nothing in history. . . . Deciding upon the best course to follow will require comprehending a minefield of risks, while poised at a crossroads, pondering the death of the dollar. The U.S. dollar has been the global reserve currency since the end of World War II. If the dollar fails, the entire international monetary system will fail with it. But optimists have always said, in essence, that confidence in the dollar will never truly be shaken, no matter how high our national debt or how dysfunctional our government. In the last few years, however, the risks have become too big to ignore. While Washington is gridlocked, our biggest rivals—China, Russia, and the oil-producing nations of the Middle East—are doing everything possible to end U.S. monetary hegemony. The potential results: Financial warfare. Deflation. Hyperinflation. Market collapse. Chaos. James Rickards, the acclaimed author of Currency Wars, shows why money itself is now at risk and what we can all do to protect ourselves. He explains the power of converting unreliable investments into real wealth: gold, land, fine art, and other long-term stores of value.

HANSGENBERG An international monetary system should provide a stable and predictable environment for international trade and investment. At the very least, it should not by itself be a source of disturbances in the world economy, and it should be designed so that policy errors or unforeseen shocks are not unduly transmitted between countries. In this perspective, worldwide integration of goods and financial markets present a particular challenge. Such integration increases the cross-border effects of economic policies at the same time as interlocking payments and financial systems transmit financial disturbances rapidly throughout the world. As the degree of integration and interdependence changes over time, is not a foregone conc1usion that international monetary institutions and mechanisms always remain well adapted to the state of the world economy. Occasional review of the performance of the system as well as proposals for improvements are therefore necessary. The contributions to this volume have l been brought together with this in mind.