<span><span>1Los Angeles 3,971,883</span><span>2
San Diego 1,394,928</span><span>3
San Jose 1,026,908</span><span>4
San Francisco <span>864,816</span></span></span>
cities or urban areas or tourist cities
It deals with opportunity costs. Opportunity costs are not real costs, but rather the things that you had to give up in order to obtain something else. What you didn't obtain is considered to be an opportunity cost. A production possibility curve deals with this.
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