The global dollar is just one example of the United States providing a global public good – useful infrastructure which everyone can use. In the post Second World War period, a myriad of global public-good economic rules was developed, covering tax, intellectual property, use of the seas (UNCLOS), global communications, space, aviation and much more. The core principle was that such rules would be beneficial for all participants, and network effects increased the benefits of additional participation.
What change has Trump bought to these global public goods? His motivation is self-interest, his operational method is bilateral rather than multilateral, and he has misunderstood tariffs. Thus the international framework will not work as smoothly, and the benefits (particularly to the United States) will be reduced.
But Trump’s objective is not an isolated autarchy. He is still interested in the “art of the deal”, including on trade and capital flows. He sees tariffs as an instrument to skew the rules-based order in his favour rather than to abandon it. His power to do this is limited by the harm tariffs do to his own country, and the ability of other countries to build alternatives, such as the Comprehensive and Progressive Agreement for Trans Pacific Partnership (CPTPP). For the most part, the international order can work without American participation – as it does, for example, in UNCLOS.
Not all international order is driven by self-interest. There has been altruism too: the World Bank, United Nations and foreign aid, as well as agreements on refugees and human rights. Here Trump’s blinkered self-interest will be more damaging. Climate change presents a variant of this problem. Conferences and targets have a role in mobilising public opinion, but success depends on individual countries acting in the collective good. A motivated hegemon would be a huge advantage here, pressuring all countries to act. But we didn’t have this in the pre-Trump order, so we are no worse off now.
As America recedes from its role as economic hegemon, the most likely future is one where much of the old order remains in place, although not working so well, and with gaps where altruistic behaviour is lacking.
Those who foresee China taking over America’s security hegemony may see China also taking over economic hegemony. This seems unlikely. The renminbi is far from becoming a global currency. It may be used in some of China’s trade transactions, but it cannot provide a substitute for the dollar’s investment role, where America’s deep financial markets, backed by stable institutions and laws, will dominate China’s capital-controlled embryonic financial markets. Will China change the rules in institutions such as the IMF and World Bank? Tweaking is possible, to make China’s policy activism, subsidies and state ownership more acceptable. But the old order did nothing to constrain such departures from free-market norms. And if China stepped forward to lead the world in climate-change action, this would be applauded by many.
Much depends on how the United States and China use their weight to distort international rules in their favour through withholding monopolised supplies (China with rare earths, America with cutting-edge chips or international payments). But economies adapt. Push your power too much, and the victims find another way.