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INCREASING OPPORTUNITY COST: The proposition that opportunity cost, the value of foregone production, increases as more of a good is produced. This 'law' is most important to the slope of the production possibilities curve. It generates the convex shape of the curve, making the curve flat at the top and steep at the bottom.

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KEYNESIAN CROSS

A diagram illustrating the basic Keynesian theory of macroeconomics, with aggregate expenditures measured on the vertical axis and aggregate production measured on the horizontal axis, with the relation between aggregate expenditures and aggregate production represented by a positively-sloped aggregate expenditures line. The "cross" aspect of this diagram is the intersection between the aggregate expenditures line and a 45-degree line indicating every point of equality between aggregate expenditures and aggregate production. The "Keynesian" aspect of this diagram is derived from John Maynard Keynes, the developer and namesake of Keynesian economics.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either a packet of address labels large enough for addresses of both the sender and the recipient or a key chain with a built-in flashlight and panic button. Be on the lookout for door-to-door salesmen.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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