Contents -- I. World Growth Spillovers -- II. Previous Studies -- III. Channels of Transmission -- IV. Quantitative Estimates of Spillovers -- V. Applications to Sub-Saharan African Countries -- VI. Conclusions -- Tables -- 1. GMM Regression Output for SSA Real GDP Growth -- 2. Sub-Saharan Africa: Out-of-Sample Real GDP Growth as Forecasted in the WEO and the GMM Model -- Figures -- 1. Sub-Saharan Africa and the Rest of the World: Real GDP Growth -- 2. Sub-Saharan Africa: Total Merchandise Exports by Destinations, 1985 to 2008 -- 3. Sub-Saharan Africa: Destination of Exports -- 4. Capital Inflows in Sub-Saharan Africa -- 5. 3-month Libor to Treasury Bill Rate Spreads and the VIX Index -- 6. Selection of the Optimal Size of Shock for the Absolute Value of Income Effect of Oil Price Changes -- 7. Percent of Non-Zeros in Variable Measuring Income Effect of Oil Price Changes Greater than 5 Percent -- 8. Recursive Estimators of the GMM Model -- 9. Out-of-Sample Forecast: Changes in Growth as Forecasted by WEO and by the Spillover Model for 2008 to 09 -- 10. Spillovers Model and WEO Forecasts Vs. Actual 2008 Real Growth -- 11. Forecasting Errors in WEO and Spillover Model for 2008 -- Box -- References.