This paper studies the relationship between export structure and growth performance. We design an exportrecommendation system using a collaborative filtering algorithm based on countries' revealed comparative advantages.The system is used to produce export portfolio recommendations covering over 190 economies and over 30 years.We find that economies with their export structure more aligned with the  recommended export structure achieve better growth performance,in terms of both higher GDP growth rate and lower growth volatility.These findings demonstrate that export structure matters for obtaining high and stable growth. Our recommendation system can serve as a practical tool for policymakers seekina actionable insights on their countriesexportpotential and diversification strategies thatmaybe complex and hard to quantify.