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Many US policymakers on both sides of the aisle, including President Trump, have called on the US Federal Reserve to cut interest rates to depreciate the US dollar. This paper uses an intertemporal general equilibrium model to explore what would likely happen if this policy was pursued. It shows that the general equilibrium effects of a depreciated real effective exchange rate brought about by lower US interest rates can result in a wide variety of unintended consequences. The paper explores what would happen if US trading partners were to retaliate by devaluing their currencies.

The growth in global current account imbalances has produced a lopsided global economy, characterised by large lenders and large borrowers, large savers and large consumers, and large exporters and large importers. For many years, the G20 has committed to reducing these imbalances. But has it been successful? Are the G20's policy prescriptions for reducing these imbalances the right ones? And have countries altered their policies because of the discussions and commitments in the G20 or not? The paper assesses whether the G20 has achieved its goal of reducing global current account imbalances. It then uses the G‐Cubed (G20) model — a multi‐country, multi‐sector, intertemporal general equilibrium model — to assess the impacts of the G20's proposed policy agenda. It shows that the G20's policy prescriptions — reducing the fiscal deficit in the United States, increasing public infrastructure investment in Germany and increasing domestic consumption in China — are not necessarily effective in reducing current account imbalances and, when imbalances are reduced, it often comes at the cost of the real economy. Finally, the paper uses the results from in‐depth interviews with 61 policymakers from across all G20 countries — including Janet Yellen, Kevin Rudd, Ben Bernanke, Haruhiko Kuroda, Jack Lew, Mark Carney and 55 others — to explore whether the G20's focus on current account imbalances influences domestic policies. It finds that, while the G20's influence has been marginal, there are ways in which it could be strengthened. The paper concludes with a discussion on how the G20's agenda could be reformed to help reduce current account imbalances in the future.

Has the G20 achieved its goals in macroeconomic cooperation since 2008? The paper organises the G20's efforts under five themes: macroeconomic stimulus, fiscal consolidation, monetary policy, the global financial safety net and global imbalances. The G20 was initially successful in each of these areas, but this success was short‐lived. While the G20 met its goals on macroeconomic stimulus, it has been less successful in reducing deficits and debt. While it was successful in increasing its resources, the global financial safety net remains too small, too fragmented and institutional reform is incomplete. While the G20 succeeded in moving to more market‐determined exchange rates and avoiding competitive devaluations, it struggled to avoid negative spillovers. Despite years of effort, the G20 has made limited progress in reducing global imbalances. Current account imbalances are creeping back to pre‐crisis levels. Public debt remains high and most economies are moving in the wrong direction in correcting imbalances in household savings and debt. The paper concludes that the G20 has done better in some areas than others. But to suggest the G20 is a forum in decline ignores its shift from reactive crisis response to longer‐term structural challenges outside of the pressing need of an immediate crisis.