Rocks in the Harbor: Beveridge and Robinson

Economists use a 'rocks in the harbor' metaphor to explain why tariffs are self-defeating obstacles to trade. Per the Conversable Economist, the analogy originated with William Beveridge in his nineteen thirty-one book on tariffs, though it's often wrongly credited to economist Joan Robinson, who footnoted Beveridge in her nineteen thirty-seven work. Beveridge argued that unilateral tariffs can't fix other nations' barriers—they just create additional obstacles at home. Robinson, writing after the Great Depression's spiral of trade restrictions, granted Beveridge's logic but suggested that when other nations impose tariffs first, retaliatory barriers might become politically necessary, even if economically inferior. The essay notes that Robinson's case, though historically illuminating, rested on assumptions—fixed exchange rates, goods-only trade, and a tight link between trade surpluses and employment—that don't match today's realities, where global supply chains cross borders and major economies show complex relationships between deficits and growth.

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