機會成本
Money Cost Versus Real Cost
We often express cost in terms of money.But this is
just a convenient unit and is not a measure of opportunity
cost. The key points are that it is fine to express
opportunity cost in money units as long as you remenber
that this is just a convenient measure and that you can't
compare opp. costs between different times when the value
of money has changed.
summarize from Economics by Michael Parkin,p.9
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◆ From: econ95_1.law.nt