ECON101 Lecture Notes - Lecture 1: Snickers, Optimal Decision, Marginal Utility

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3 key economic ideas: we interact with one another in markets. Market - a group of buyers and sellers of a good or service and the institution by which they come together to trade. Ex: market for snickers bars, market for college degrees. In analyzing markets, we generally assume: people are rational, people respond to economic incentives, optimal decision are made at the margin. Rational - means people are using all available information to achieve their goals. Rational consumers and firms weigh the benefit and costs of each action, and try to make the best decision possible. Ex: apple doesn"t randomly choose the price of the iphone; it chooses the prices that it thinks will be most profitable: people respond to incentives. As incentives change, the actions that people will take change. Margin - an extra amount of something that can be used if it is needed .

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