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SAVING-INVESTMENT MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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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 waiting for visits from door-to-door solicitors hoping to buy either a wall poster commemorating the 2000 Presidential election or a rechargeable flashlight. Be on the lookout for strangers with large satchels of used undergarments.
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Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"Concentration is the secret of strength in politics, in war, in trade, in short in all management of human affairs. "

-- Ralph Waldo Emerson, philosopher, poet

IJIO
International Journal of Industrial Organization
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