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January 16, 2018 

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AP: The abbreviation for average product, which is the quantity of total output produced per unit of a variable input, holding all other inputs fixed. It is found by dividing total product by the quantity of the variable input. Average product, abbreviated AP also goes by the alias of average physical product (APP), so don't be confused by the extra term (physical).

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PUBLIC GOOD: A good that's difficult to keep nonpayers from consuming (excludability), and use of the good by one person doesn't prevent use by others (rival consumption). Examples include national defense, a clean environment, and any fourth of July fireworks display. Public goods are invariably provided by government because there's no way a private business can profitably produce them. Private businesses can't sell public goods in markets, because they can't charge a price and keep nonpaying people away. Moreover, businesses shouldn't charge a price, because there's no opportunity cost for extra consumers. For efficiency, government needs to pay for public goods through taxes.

     See also | good types | excludability | rival consumption | efficiency | market | exchange | market failure | common-property good | near-public good | private good | free-rider problem |


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PRODUCT LIFE CYCLE

The different stages that a product traverses over the course of its life from initial availability (birth) to eventual unavailability (death). The key stages are development, introduction, growth, maturity, saturation, and decline. The product life cycle, represented by an S-shaped curve, is an adaptation of the biological life cycle and is common to the study of marketing. It is also important in the analysis of innovation and economic instability. In addition to biological growth, comparable S-shaped life cycles are found in short-run production of a firm, the growth of a person's income, the acquisition of knowledge, and the development of a civilization.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"Good humor is a tonic for mind and body. It is the best antidote for anxiety and depression. It is a business asset. It attracts and keeps friends. It lightens human burdens. It is the direct route to serenity and contentment."

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