Another way of saying you want your country to be involved in high productivity growth industries, is that you want it to be in industries whose outputs are getting less and less valuable.
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If light bulbs were in very limited supply & thus extremely costly, you'd likely only see them used by people who had extremely valuable things to do at night. By even a colloquial definition, the marginal value of a light bulb would be much higher... in a much poorer world.
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But if the world is already overrun with cheap lightbulbs, we might get more utility out of a tiny bit more massage/education/hairdressing more than yet another lightbulb.
End of conversation
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