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February 2, 2026 

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AGGREGATION: The process of adding up, summing, or otherwise identifying the total value of a variable or measure, especially when used in the study of macroeconomics. Common items that are aggregated are demand, supply, and expenditures on gross domestic product, which result in aggregate demand, aggregate supply, and aggregate expenditures.

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MARGINAL PROPENSITY TO SAVE

The proportion of each additional dollar of household income that is used for saving. The marginal propensity to save (abbreviated MPS) is another term for the slope of the saving line and is calculated as the change in saving divided by the change in income. The MPS plays a central role in Keynesian economics. It quantifies the saving-income relation, which is the flip side of the consumption-income relation, and thus it reflects the fundamental psychological law. It is also a critical to the multiplier process. A related saving measure is the average propensity to save.

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Fact 1: Our Limited Pie

The first stop for any pedestrian on a leisurely stroll through the busy economic streets of Shady Valley is Scarcity Stan's Ye Olde Bakery Shoppe and Confectionery Palace. The most noted pastry on Scarcity Stan's list of delectables, wedged between his mouth-watering apple danishes and scrumptious jelly donuts, is economic pie. My mouth waters with the thought.

Economic pie isn't like other donuts, cakes, and confectioneries with their gobs of sweetness, but very little nutritional sustenance. In fact, given that it refers to the sum total of the economy's resources and productive activity, economic pie is filled to the brim with sustenance. Unfortunately, Scarcity Stan and the congregation of people we call society, has only one economic pie, and while it's pretty large, it's never quite as big as we would like.
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YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either a package of blank rewritable CDs or yellow cotton balls. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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This isn't me! What am I?

Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"We tend to forget that happiness doesn't come as a result of getting something we don't have, but rather of recognizing and appreciating what we do have."

-- Fredrick Koeing

MPI
Marginal Propensity to Invest
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