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This paper attempts to quantify the extent to which U.S. growth is an “engine”of the world economy. Results based on fixed-effects estimation using panel datasuggest a significant positive impact of U.S. growth on growth in the rest of theworld, especially developing countries, in recent decades. The impact is as large asone-for-one in some specifications. The results are robust to alternativespecifications and to the alternative claim that world growth in recent decades hasbeen driven predominantly by common global shocks. JEL classifications: O4, F15