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PPC: The abbreviation for production possibilities curve, which is a curve that illustrates the production possibilities for the economy. A production possibilities curve represents the boundary or frontier of the economy's production capabilities. That's why it's also frequently termed a production possibilities frontier (or PPF). As a frontier, it is the maximum production possible given existing (fixed) resources and technology. Producing on the curve means resources are fully employed, while producing inside the curve means resources are unemployed. The law of increasing opportunity cost is what gives the curve its distinctive convex shape.

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THREE-SECTOR KEYNESIAN MODEL

A Keynesian model of the macroeconomy that includes the three domestic sectors, the household sector, the business sector, and the government sector. This Keynesian model variation adds the government sector (or public sector) to the household and business sectors that make up the two-sector model. This model enables an analysis of government stabilization policies, especially how fiscal policy changes in government purchases and taxes can be used to close recessionary gaps and inflationary gaps. Equilibrium is identified as the intersection between the C + I + G line and the 45-degree line. Two related models are the two-sector Keynesian model and the four-sector Keynesian model.

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Today, you are likely to spend a great deal of time at a flea market hoping to buy either a 50 foot extension cord or a combination CD player, clock radio, and telephone (with answering machine). Be on the lookout for slightly overweight pizza delivery guys.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

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