You are the type of person who can see the solutions to problems when others fail even to see the problems. Family and friends worry that some day you will leave home in the morning, deep in thought, and end up in another state. Today, you are likely to spend a great deal of time lost in your local discount super center looking to buy either a coffee cup commemorating next Thursday or a replacement remote control for your stereo system. Be on the lookout for jovial bank tellers. You should consider shopping at stores or businesses beginning with the letter F, but do not buy any products with a serial number or product code containing the number 097625. 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.

The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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Our little excursion through the economy has had, thus far, its ups and downs. My cable bill remains permanently confused and my checking account has a large property-tax created imbalance, but at least the pain in my tooth stops before hitting my toes. I think we deserve a little rest and relaxation at the Shady Valley's own tourist mecca, Happy-Time Gala-World Fun-Land Extravaganza Amusement Park. Let's take a brief respite from our pedestrian trek and give the soles of our jogging shoes a well-deserved rest.

The Happy-Time Gala-World Fun-Land Extravaganza Amusement Park has the world famous Monster Loop Death Plunge roller coaster, guaranteed to make riders yearn for the pleasures of a Siberian forced labor camp. There's also the Enchanted Haunted Horror House filled with serial killers, chainsaw murders, and IRS auditors. For the more timid, and fortunately, for those more interested in the workings of our economy, the merry-go-round is the ride of choice.

Two familiar faces are enjoying the circular trip on their fiberglass ponies. The slender guy with the bushy mustache is Dan Dreiling, the drywall man. I had him repair a hole in my living room wall caused by an over-excited vacuum cleaner a few months back. The disgusted look on his dusty face tells me that I must have overlooked his $100 bill. The other recognizable rider is Pollyanna Pumpernickel a precocious pet store owner who has somehow neglected to pay me the $100 due for hamster-sitting services which I rendered a few weeks ago. Her furtive glances suggest that she is well aware of her liability.
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