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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 2: Economic Science | Unit 5: Cause and Effect Page: 19 of 20

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Advertising is unlikely to be the DIRECT cause of greater sales and production.
  • First link: Advertising increases buyers' preferences.
  • Second link: Buyers' preferences increase market demand and market price.
  • Third link: Higher price induces suppliers to increase production.
Scientific answer:
  • The increase in sales and production are caused by higher prices, which is caused by greater demand, which is caused by a change in buyers' preferences, which is caused by advertising.
  • The goal of the scientific study of economics is to identify these distinct, but interrelated cause-and-effect principles.

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PERFECT COMPETITION, LONG-RUN EQUILIBRIUM CONDITIONS

The long-run equilibrium of a perfectly competitive industry generates six specific equilibrium conditions, including: (1) economic efficiency (P = MC), (2) profit maximization (MR = MC), (3) perfect competition (MR = AR = P), (4) breakeven output (P = AR = ATC), (5) minimum production cost (MC = ATC), and (6) minimum efficient scale (MC = ATC = LRAC = LRMC).

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Today, you are likely to spend a great deal of time going from convenience store to convenience store wanting to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for defective microphones.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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