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Notes from Ch. 4 of Price Theory and Applications, 7th ed., by Jack Hirshleifer, Amihai Glazer, and David Hirshleifer:

## 4.1 Optimum of the ConsumerEdit

Budget Line the frontier of the market opportunity set of two goods that can be purchased by a consumer with a limited amount of money. For instance, if a consumer has an income (I) of \$100, and she is considering purchasing good X priced at \$2 ($Px$) per unit and Y priced at at \$1 ($Py$), her budget line and market opportunity set would be as follows: