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April 23, 2026 

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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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TOTAL FACTOR COST, PERFECT COMPETITION

The opportunity cost incurred by a perfectly competitive firm when using a given factor of production to produce a good or service. This is the total cost associated with the use of a particular resource or factor of production--it is the total cost of the factor. For a perfectly competitive firm, the price paid is constant and total factor cost increases at a constant rate. Total factor cost is predominately used in the analysis of the factor market. Two derivative factor cost measures are average factor cost and marginal factor cost.

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Scraping Up The POLLUTION

One of Shady Valley's featured factories is Mona Mallard's Duct Tape Industries. It's the world's leading producer of duct tape -- that shiny, seemingly omnipresent, cloth-like tape that's used for everything EXCEPT ventilation ducts. Mona Mallard's Duct Tape Industries also employs thousands of voting, taxpaying Shady Valley residents. The amount of campaign money, legal and otherwise, contributed by Mona Mallard herself to Shady Valley politicians is, well, incalculable. All of this means that our little pedestrian exploration through the backlot dumping ground of Mona Mallard's Duct Tape Industries main production plant puts us on very, VERY sensitive turf. The reason, of course, is that the duct tape plant has been discarding sticky, toxic, gooey junk onto the ground. This is a potentially hazardous situation, not only because this sticky, toxic, gooey junk appears to be leaking into the Shady Valley River, but because a Mona Mallard's Duct Tape Industries security guard is headed in our direction. Rather than confront this guard, I suggest we spend our time exploring the problems of pollution. RUN!
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for pencil sharpeners with an attitude.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"The past cannot be changed. The future is yet in your power. "

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