The opportunity cost of holding money is the nominal interest
rate.
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Opportunity cost is the highest-valued alternative foregone in
order to take an economic action.
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Look up Production Possibility Frontier, it is the same thing as
a Opportunity Cost Curve.
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opportunity cost of saving is when you save money then
economically spend from your saving this may vary to what person
you are
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The cost of an alternative that must be forgone in order to
pursue a certain action. Put another way, the benefits you could
have received by taking an alternative action.