["Oxford Bulletin of Economics and Statistics, EarlyView. ", "\nABSTRACT\nThe paper examines the macroeconomic effects of public investment in emerging market and developing economies (EMDEs). To this end the analysis develops a new measure of public investment shocks based on cyclically adjusted government investment. Estimations using local projections based on a sample of 129 countries over the period 1980–2019 suggest that public investment can significantly boost economic growth, crowd in private investment, and increase productivity and potential output. Estimates suggest that an increase in public investment by 1% of GDP raises real output by 1.1% after 5 years, on average. However, the effects are much larger when public investment spending is efficient and fiscal space is ample—reaching up to 1.6% over the same period. Public investment multipliers tend to be larger during recessions and in capital scarce economies.\n"]