Trade Isn’t Zero-Sum — But Its Gains Aren’t Automatically Shared

贸易并非零和博弈：但其收益不会自动惠及所有人

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Exporting cars to Germany benefits automakers, steel suppliers, and logistics firms — yet factory towns losing assembly jobs feel no direct gain from that success.
Lower import prices help consumers stretch budgets, but workers displaced by foreign competition may wait years before finding comparable wages elsewhere.

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