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MARGINAL COST AND DIMINISHING MARGINAL RETURNS: Decreasing then increasing marginal cost that gives rise to a U-shaped marginal cost curve reflects increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of production in the short run.

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INVISIBLE HAND

The notion that buyers and sellers, consumers and producers, households and businesses, by pursuing their own self-interests do what is best for the economy automatically without any government intervention, as if guided by an invisible hand.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a half-dozen helium filled balloons or a packet of address labels large enough for addresses of both the sender and the recipient. Be on the lookout for slightly overweight pizza delivery guys.
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More money is spent on gardening than on any other hobby.
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Bayesian VAR (Vector Autoregression)
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