Global Imbalances and Policy Wars at the Zero Lower Bound

Abstract

This paper explores the consequences of extremely low equilibrium real interest rates in a world with integrated but heterogenous capital markets and nominal rigidities. In this context, we establish five main results: (i) Economies experiencing liquidity traps pull others into a similar situation by running current account surpluses; (ii) Reserve currencies have a tendency to bear a disproportionate share of the global liquidity trap|a phenomenon we dub the “reserve currency paradox”; (iii) While more price and wage flexibility exacerbates the risk of a deflationary global liquidity trap, it is the more rigid economies that bear the brunt of the recession; (iv) Beggar-thy-neighbor exchange rate devaluations provide stimulus to the undertaking country at the expense of other countries (zero-sum); and (v) Safe public debt issuances, helicopter drops of money, and increases in government spending in any country are expansionary for all countries (positive-sum). We use these results to shed light on the evolution of global imbalances, interest rates, and exchange rates since the beginning of the global financial crisis.Institutional subscribers to the NBER working paper series, and residents of developing countries may download this paper without additional charge at www.nber.org.