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In economics, one of the most important concepts is 'opportunity cost' - the idea that once you spend your money on something, you can't spend it again on something else.

Malcolm Turnbull
Opportunity, Ideas, Important
"Biography/Personal Quotes". www.imdb.com.
In economics, one of the most important concepts is 'opportunity cost' - the idea that once you spend your money on something, you can't spend it again on something else.