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TIE-IN SALE: A type of sale in which consumers can buy one good only if they purchase another good as well. For example, if your grocery store sells you a bag of tea with the condition that you buy a pound of sugar, that would be a tie-in sale. Because they allow a monopoly to increase its profit over what it could make by selling the two goods separately at constant prices, tie-in sales can be used to price discriminate. However, it is important to realize that there are other reasons for tie-in sales other than price discrimination, such as to increase efficiency. For example, when we buy a car, it comes as a package of several goods (tires, engine, etc), which would be very difficult (and inefficient) for consumers to assemble if they were bought separately.

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MONEY CREATION, THE PROCESS

The process in which the banking system creates checkable deposits by lending excess reserves. The total amount of checkable deposits (and money) created by the banking system depends on the amount of excess reserves available and the reserve requirement ratio specifying the reserves needed to back up deposits. The money creation process is the movement of reserves from bank to bank, with each bank using excess reserves to make loans (and checkable deposits), then keeping a fraction of the reserves to back up newly created deposits. The deposit expansion multiplier captures the money creation process, indicating the amount of checkable deposits created if the banking reserve acquires a given amount of excess reserves.

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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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