You are the type of person who shops when you have to and buys what you need, but usually has more important things to do. Family and friends are prone to remind you of the current decade whenever they take note of your clothing ensemble. Today, you are likely to spend a great deal of time flipping through the yellow pages trying to buy either a video game player or an AC adapter that won't fry your computer. Be on the lookout for broken fingernail clippers. You should consider shopping at stores or businesses beginning with the letter X, but do not buy any products with a serial number or product code containing the number 049431. Your preferred shopping venue is the Internet. Your special symbol is the exclamation point (!).

As a Purple Smarphin, you are the brightest and most intelligent person you know. And that goes for shopping, too. You know exactly what you want. You know exactly what it costs. You know exactly when and where to buy. But, of course, shopping is only one of the many activities that attracts your intellectual attention. You shop when you need to and buy if have to, but shopping is not the end all of your life.

A mathematical connection between average factor cost and marginal factor cost stating that the change in the average factor cost depends on a comparison between average factor cost and marginal factor cost. For perfect competition, with no market control, marginal factor cost is equal to average factor cost, and average factor cost does not change. For monopsony and other firms with market control, marginal factor cost is greater than average factor cost, and average factor cost rises.

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Mona Mallard Duct Tape Industries, the world's a leading producer of duct tape (that all-purpose, omni-present, shiny gray tape), is located right here in Shady Valley. Perhaps you've heard that they recently developed a new-fangled form of duct tape that's certain to revolutionize duct tape as we know it. This revolutionary development has, however, created a "situation" that we, pedestrian explorers of the economy, should consider. Mona Mallard's new duct tape uses "quagliminium," a relatively limited mineral found only in the quaint and courteous Republic of Northwest Queoldiola. Prior to this duct tape development, quagliminium had only one use, as lubricant for OmniStraight shoestring straighteners. The Northwest Queoldiolan supplies were sufficient to lubricate shoestring straighteners well into the year 3000. As a duct tape input, though, quagliminium deposits will be exhausted in a scant 50 years. Should we, could we, allow Mona Mallard to exhaust the supply of quagliminium? If they do, how will future generations lubricate their shoestring straighteners? Should we call for a moratorium on quagliminium use?
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