You are the type of person who considers shopping an interesting intellectual exercise. Family and friends generally call the local library when they can't find you, and rightfully so. Today, you are likely to spend a great deal of time searching for a specialty store wanting to buy either software that won't crash your computer or any book written by Stephan King. Be on the lookout for door-to-door salesmen. You should consider shopping at stores or businesses beginning with the letter G, but do not buy any products with a serial number or product code containing the number 654920. 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 relation between market price and the quantity supplied by all firms in a perfectly competitive industry after the industry has completed its long-run adjustment. The long-run industry supply curve effectively traces out a series of equilibrium prices and quantities that reflect long-run adjustments of a perfectly competitive industry to demand shocks. This long-run adjustment can take one of three paths, indicating an increasing-cost industry, a decreasing-cost industry, and a constant-cost industry.

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Good news! Manny Mustard, my long-time friend and proprietor of Manny Mustard's House of Sandwiches is having a special on his Deluxe Club Sandwich. Let's drop in for a brief respite -- and lunch. More good news! Manny is bubbling profusely about the vitality of his business. Last month he turned a profit. Yes, that much cherished profit, the goal of business firms, be they large or small. Upon closer inspection Manny's profit calculation might be suffering from an oversight or two. It seems as though Manny neglected to pay himself a wage. Nor did he bother to include any interest expense on the savings he invested in his House of Sandwiches venture. But what the heck, he earned a profit -- didn't he?
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