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July 9, 2025 

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UNLIMITED LIABILITY: A condition in which owners are personally held responsible for any and all debts created by a business. Proprietorships and partnerships are the two kinds of businesses in which owners have unlimited liability. The primary problem with unlimited liability is that it limits the size of a business and prevents it from taking advantage of large scale production.

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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

     See also | market power | monopoly | price | competitive market | price maker | price leadership | marginal-cost pricing | price-cost margin |


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LERNER INDEX, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 9, 2025].


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MARGINAL PROPENSITY TO IMPORT

The change in imports purchased from the foreign induced by a change in income or production (national income or gross domestic product). The marginal propensity to import (abbreviated MPM) is another term for the slope of the imports line and is calculated as the change in imports divided by the change in income or production. The MPM plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a graduation present for your niece or nephew or a toaster oven that has convection cooking. Be on the lookout for rusty deck screws.
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