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SPATIAL DIFFERENTIATION: The notion that economic activity is not evenly dispersed across the land. That is, goods, services, resources, production, and consumption are more concentrated at some locations and less concentrated at other locations due to natural endowments and human activity. The result is that no two location points have exactly the same access to inputs or outputs. This is a fundamental principle underlying the study of urban and regional economics and implies that firms and households must include transportation cost and location in production and consumption decisions.

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INJECTIONS LINE

A graphical representation of the relation between the level of aggregate production and one or more injections. The three injections (non-consumption expenditures on aggregate production) are investment expenditures, government purchases and exports. The injections line sequentially adds, or layers, each of these three expenditures depending on the number of sectors used in the analysis (two, three, or four). The slope of the injections line depends on which if any of the expenditures are induced by aggregate production. The injections line is combined with the leakages line (containing saving, taxes, and imports) in the Keynesian injections-leakages model.

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WHITE GULLIBON
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a birthday gift for your father that doesn't look like every other birthday gift for your father or a green fountain pen. Be on the lookout for telephone calls from long-lost relatives.
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More money is spent on gardening than on any other hobby.
"What you get by achieving your goals is not as important as what you become by achieving your goals."

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MSE
Mean Squared Error
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