ECON 2310 Lecture Notes - Lecture 5: Demand Curve, Normal Good, Engel Curve

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A budget constraint: the consumption bundles a consumer can afford over some period of time. Budget li(cid:374)e: (cid:272)o(cid:374)su(cid:373)ptio(cid:374) (cid:271)u(cid:374)dles that just e(cid:454)haust a (cid:272)o(cid:374)su(cid:373)er"s i(cid:374)(cid:272)o(cid:373)e. Changes in income and prices move the budget line. Budget lines are parallel because their slopes are equal to the price ratio (times -1) A change in the price of a good rotates the budget line- outward for a decrease and inward for an increase. An increase of price in a product rotates the budget line toward the origin. If the consumer only buys pizza for example, the price change has no effect on what he can afford, but if he only buys yogurt and the yogurt price went up, he can afford 1/3 as before. Interior choice/solution: there are affordable bundles containing a little bit more of that good and affordable bundles containing a little bit less of it. Tangency condition: if at (cid:271)u(cid:374)dles, the (cid:271)udget li(cid:374)e lies ta(cid:374)ge(cid:374)t to the (cid:272)o(cid:374)su(cid:373)er"s i(cid:374)differe(cid:374)(cid:272)e curve.

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