The buffer value of trade: quantifying how global integration stabilizes food prices and farm incomes

International trade plays a critical but often underappreciated role in stabilizing global food systems. This study quantifies the buffer value of trade by comparing observed conditions of global integration with a counterfactual restricted-trade world (half trade volume). Using a global market equilibrium model of agriculture combined with a novel randomized yield-shock framework, we evaluate how production volatility translates into volatility in consumer food prices and farm incomes across global regions in 1991–2020. Results show that trade substantially dampens volatility transmission. In the United States, year-on-year volatility in farm income declines nearly threefold under open trade (from 12.1 to 3.9), while the standard deviation of consumer food price volatility falls by more than half (from 9.1 to 4.3). Globally, the volatility multiplier ratio (the extent to which production shocks amplify consumer price volatility) drops from 4 to 6 in restricted trade to just 1–2 under open markets. These findings highlight the risk-sharing role of trade: while trade barriers may protect producers in the short run, they amplify vulnerability to local shocks in the long run. Strengthening international market integration, alongside domestic investments in resilience, remains essential for managing volatility in an era of increasing uncertainty.