身边的经济学·社会常识英语30篇（1）

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规模经济与边际成本

When a bakery doubles its output, it doesn’t need to double ovens, staff, or rent—so cost per loaf drops.
This idea, called ‘economies of scale,’ explains why mass-produced phones cost less than handmade ones—even with better parts.
Marginal cost is what it takes to make *one more* item—often far less than the average once systems run smoothly.
But scaling up has limits: overcrowded factories cause delays, and giant supply chains become fragile during shocks.
Streaming services spent billions on tech and licenses—then added millions of users at almost zero extra cost per person.
Small farms may pay more per kilogram to ship vegetables, but they gain flexibility and closer ties to local buyers.
Scale isn’t magic—it’s about matching size to purpose, not chasing ‘bigger’ for its own sake.
Smart growth asks: ‘Where does adding more actually help—and where does it just add noise?’