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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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PROPRIETORSHIP

A business organization that is owned and operated by one person. The owner and the business are legally considered one and the same. As such, the owner receives any and all profit and is responsible for any and all debts, what is termed unlimited liability. A proprietorship is one of the three basic forms of business organization. The other two are partnership and corporation. A large number of proprietorships exist in the economy, but they tend to be relatively small operations.

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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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