Sal Khan
How do you decide what to produce or trade? How can you maximize happiness in a world of scarcity. What are you giving up when you choose something (i. e. , opportunity cost)? Source: Khan Academy (www.khanacademy.org), used under the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) license. All Khan Academy content is available for free at www.khanacademy.org. Khan Academy does not endorse the World Public Library.
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