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This paper looks at the question of adequacy of reserves in sub-Saharan African countries in light of the shocks faced by these countries. Literature on optimal reserves so far has not paid attention to the particular shocks facing low-income countries. We use a two-good endowment economy model facing terms of trade and aid shocks to derive the optimal level of reserves by comparing the cost of holding reserves with their benefits as an insurance against a shock. We find that the optimal level of reserves depends upon the size of these shocks, their probability, and the output cost associated with them,

This paper presents a version of the global integrated monetary fiscal (GIMF) model adapted and calibrated to the Argentine economy. The model replicates the effect of the strong improvement in Argentina's terms of trade stemming from higher world commodity prices as well as other key economic trends in Argentina during the period 2003-2007. The model can be used to assess the potential impact of different combinations of monetary and fiscal policies on output, inflation, and the external trade.

This paper develops a structural macroeconometric model of the world economy, disaggregated into thirty five national economies. This panel unobserved components model features a monetary transmission mechanism, a fiscal transmission mechanism, and extensive macrofinancial linkages, both within and across economies. A variety of monetary policy analysis, fiscal policy analysis, spillover analysis, and forecasting applications of the estimated model are demonstrated, based on a Bayesian framework for conditioning on judgment.

We describe unique aspects of microstates-they are less diversified, suffer from lumpiness of investment, they are geographically at the periphery and prone to natural disasters, and have less access to capital markets-that may make the current account more vulnerable, penalizing exports and making imports dearer. After reviewing the \"old\" and \"new\" view on current account deficits, we attempt to identify policies to help reduce the current account. Probit regressions suggest that microstates are more likely to have large current account adjustments if (i) they are already running large current account deficits; (ii) they run budget surpluses; (iii) the terms of trade improve; (iv) they are less open; and (v) GDP growth declines. Monetary policy, financial development, per capita GDP, and the de jure exchange rate classification matter less. However, changes in the real effective exchange rate do not help drive reductions in the current account deficit in microstates. We explore reasons for this and provide policy implications.

Output drops are usually associated with major disruption for the residents of affected countries, both directly and often through ensuing, prolonged growth slowdowns. Using a century of data, we document that output drops are more frequent in countries at a lower stage of economic development. We then turn to a more in-depth analysis of the post-1970 era, examining output drops in a large panel of countries, and systematically relating them to a variety of shocks. We compute the expected cost of each type of shock as a function of the shock's frequency, the likelihood that the shock will be associated with a drop in output, and the size of the output drop. The largest costs are associated with external financial shocks (notably, sudden stops in financial flows) for emerging markets, and with real external shocks (in particular, terms-of-trade shocks) for developing countries.

The 2008-2010 food crisis might have been a harbinger of fundamental climate-induced food crises with geopolitical implications. Heat-wave-induced yield losses in Russia and resulting export restrictions led to increases in market prices for wheat across the Middle East, likely contributing to the Arab Spring. With ongoing climate change, temperatures and temperature variability will rise, leading to higher uncertainty in yields for major nutritional crops. Here we investigate which countries are most vulnerable to teleconnected supply-shocks, i.e. where diets strongly rely on the import of wheat, maize, or rice, and where a large share of the population is living in poverty. We find that the Middle East is most sensitive to teleconnected supply shocks in wheat, Central America to supply shocks in maize, and Western Africa to supply shocks in rice. Weighing with poverty levels, Sub-Saharan Africa is most affected. Altogether, a simultaneous 10% reduction in exports of wheat, rice, and maize would reduce caloric intake of 55 million people living in poverty by about 5%. Export bans in major producing regions would put up to 200 million people below the poverty line at risk, 90% of which live in Sub-Saharan Africa. Our results suggest that a region-specific combination of national increases in agricultural productivity and diversification of trade partners and diets can effectively decrease future food security risks.