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July 18, 2025 

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ANNUITY: The receipt of payments at regular intervals from a established fund. Annuities are commonly used for insurance and retirement programs. It works in this way: A fund, which can be established either through a one-time sum of money or a series of payments, is exhausted over time with fixed, periodic payments. The amount of each payment depends on the interest accrued on the outstanding balance in the fund, and the length of time scheduled to exhaust the fund. For example, if your pension plan is based on an annuity that begins payments at the age of 65, then the size of the payments depends on whether you expect to live 5, 10, 15, or more years and set up payments accordingly. It's very similar to amortization, but in the reverse direction.

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PERFECT COMPETITION CHARACTERISTICS: The four key characteristics of perfect competition are: (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics mean that a given perfectly competitive firm is unable to exert any control whatsoever over the market.

     See also | perfect competition | assumption | mobility | industry | firm | technology | market | price taker | price maker | substitute | resources | barrier to entry | perfect competition and demand | perfect competition and efficiency | perfect competition and short-run supply curve | monopoly | monopolistic competition | oligopoly |


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PERFECT COMPETITION CHARACTERISTICS, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].


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AVERAGE REVENUE AND MARGINAL REVENUE

A mathematical connection between average revenue and marginal revenue stating that the change in the average revenue depends on a comparison between average revenue and marginal revenue. For perfect competition, with no market control, marginal revenue is equal to average revenue, and average revenue does not change. For monopoly and other firms with market control, marginal revenue is less than average revenue, and average revenue falls.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers wanting to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for high interest rates.
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More money is spent on gardening than on any other hobby.
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