scarcity - unlimited wants but limited resources, incentives - positive or negative rewards for behavior, cost/benefit analysis - this type of analysis results in the benefits outweighing the cost, trade makes people better off - specializing in one thing as a seller to a buyer who specializes in one thing, markets coordinate trade - stores vs. online (e-commerce), unintended consequences - the law is made but something else happens unexpectedly as a result, marginal analysis - there can be too much of a good thing,

Principles of Economics review

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