A Keynesian model of the macroeconomy that includes the two private sectors, the household sector and the business sector. This Keynesian model variation, often termed the basic Keynesian model or the private sector Keynesian model, captures the interaction between induced consumption expenditures and autonomous investment expenditures. This model is commonly used to illustrate the basic workings of Keynesian economics, including equilibrium, disequilibrium, and the multiplier. Equilibrium is identified as the intersection between the C + I line and the 45-degree line. Two related variations are the three-sector Keynesian model and the four-sector Keynesian model.

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It's time for another one of our frequent stops at Mr. Market Super Food Discount Store, this time to check out the story behind retail prices. As consumers, we spend a large fraction of our nonworking, nonsleeping lives wandering grocery stores aisles, searching clothing store racks, and surveying department store displays for the right product at the right price. How do we know, like the name of the long-running game show, if "The Price is Right?" How are retail prices set and do they really tell us the value of a product?
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Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a remote controlled sports car with an air spoiler or semi-gloss photo paper that works with your neighbor's printer. Be on the lookout for slow moving vehicles with darkened windows.
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