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INJECTION-LEAKAGE MODEL: A model used in Keynesian economics based on the equality of non-consumption expenditures (or injections) and non-consumption uses of income (leakages). On one side of the equality is saving, taxes, and imports -- the non-consumption leakages. On the other side of the equality is investment, government purchases, and exports -- the non-consumption injections. The injection-leakage model provides an alternative to the Keynesian cross for identifying equilibrium aggregate output.

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Lesson 4: Production Possibilities | Unit 1: Getting Started Page: 2 of 24

Topic: Assumptions <=PAGE BACK | PAGE NEXT=>

Every economic analysis builds on certain preconditions or assumptions. Assumptions, whether reasonable or seemingly unrealistic, let us:
  1. Establish abstract benchmarks for comparison or
  2. Break an analysis into simpler, more easily manageable parts.

Four key assumptions:

  • Two Goods: Resources are used to produce one or both of only two goods. This is a simplifying assumption that lets us display graphs on the screen.
  • Fixed Resources: The quantities of the labor, capital, land, and entrepreneurship resources do not change. This is a reasonable assumption that we can change to analysis resource changes.
  • Fixed Technology: The information and knowledge that society has about the production of goods and services is fixed. This is another reasonable assumption that we can change to analysis technology changes.
  • Technical Efficiency: Resources are used in a technically efficient way. We get the maximum possible production out of the resource inputs.

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MARGINAL REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time at a flea market seeking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for letters from the Internal Revenue Service.
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