One of these econ-speak terms is “marginal decision-making.” It’s an important element of how we choose, so let’s spend some time on it. The minimum equity requirement for a margin account is $2,000. P. 6. a. •After studying many hours, a student might ask herself: “Should I study one more hour?” •This question is a question at the margin. He/she pays interest on the funds borrowed until the loan is repaid. Marginal analysis is an examination of the additional benefits of an activity when compared with the additional costs of that activity. In fact, however, the airline can raise its profits by thinking at the margin. Of course, it should. Margin means buying securities, such as stocks, by using funds you borrow from your broker. For each trade made in a margin account, we use all available cash and sweep funds first and then charge the customer the current margin interest rate on the balance of the funds required to fill the order. A marginal change is a small adjustment to an existing plan of action. A margin requirement is the leverage offered by a broker, and is usually updated at least once a month to account for market volatility or currency exchange rates. Buying stock on margin is similar to buying a house with a mortgage. The 200 seat plane is nearly, but not quite, sold out, and the total costs … Rational people are people who systematically and purposely do the best they can to achieve their objectives. Therefore, rationality does not require people to be A 2% margin requirement is the equivalent of offering a 50:1 leverage, which allows an investor to trade with $10,000 in the market by setting aside only $200 as a security deposit. [a deriv*****] example: Suppose you are an airline executive deciding whether to sell a standby ticket for $300. Rational people think at the margin. In order to do this, there are 4 principles of individual decision-making: facing trade-offs, evaluating what one is giving up to obtain their goal, thinking at the margin, and responding to incentives. margin. •Deciding whether to add or subtract one additional unit occurs at the margin. Should the airline sell it to him? The Economic Way of Thinking A choice involves a tradeoff. Imagine that a plane is about to take off with ten empty seats, and a standby passenger is waiting at the gate willing to pay $300 for a seat. A trade-off involves a sacrifice that must be made to get a certain product or experience. ♦ The big tradeoff is the tradeoff between equality and efficiency that occurs as a result of government programs redistributing income. A tradeoff is an ex-change—giving up one thing to get something else.Tradeoffs include the “what” tradeoffs, the “how” tradeoffs, and the “for whom” tradeoffs. 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