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January 17, 2026 

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IMPLICIT COST: An opportunity cost that does NOT involve a money payment or a market transaction. This should be contrasted with explicit cost that DOES involve a money payment or a market transaction. The common misconception among non-economists out there in the real world is that the term "cost" is synonymous with the term "payment," that is, all costs are explicit costs, to be a cost you have to give up some money. Well, I'm here to tell you that this isn't true. Cost is opportunity cost. It's the satisfaction NOT received from activities NOT pursued. It's the value of foregone production. And not all opportunity costs involve a money payment.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Today, you are likely to spend a great deal of time at a crowded estate auction trying to buy either a wall poster commemorating yesterday or pink cotton balls. Be on the lookout for neighborhood pets, especially belligerent parrots.
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General Electric is the only stock from the original 1896 Dow Jones Industrial Average remaining in the current index.
"Being defeated is only a temporary condition; giving up is what makes it permanent."

-- Marilyn vos Savant, Author

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