清华大学:《微观经济学》课程PPT教学课件(PPT讲稿)Chapter Three Preferences

Chapter Three Preferences 消费者偏好
Chapter Three Preferences 消费者偏好

Where are We in the course We are studying the 1st of the three blocks of microeconomics: Consumer behavior, production theory, and market equilibrium Within the 1st block, we are working on the 2nd of the three components: choice set, preference, and consumer demand
Where Are We in the Course? We are studying the 1st of the three blocks of microeconomics: Consumer behavior, production theory, and market equilibrium Within the 1st block, we are working on the 2nd of the three components: choice set, preference, and consumer demand

What Do We Mean by Preference?(偏好) It refers to the ordered relationship among alternative choices given by an economic agent In most economic literature, consumer preference is treated as the ultimate exogenous element
What Do We Mean by Preference? (偏好) It refers to the ordered relationship among alternative choices given by an economic agent. In most economic literature, consumer preference is treated as the ultimate exogenous element

Preference relations Comparing two different consumption bundles, x and y: strict preference: x is more preferred than is y weak preference: x is as at least as preferred as is y Indifference: x is exactly as preferred as is y
Preference Relations Comparing two different consumption bundles, x and y: – strict preference: x is more preferred than is y. –weak preference: x is as at least as preferred as is y. – Indifference: x is exactly as preferred as is y

Notations X denotes strict preference; denotes indifference. denotes weak preference
Notations denotes strict preference; ~ denotes indifference; denotes weak preference; p ~ f

Preference relations x y andy x imply xy X y and(not y x)imply x>y
Preference Relations x y and y x imply x ~ y. x y and (not y x) imply x y. ~ f ~ f ~ f ~ f p

Assumptions about Preference Relations Completeness: For any two bundles x and y it is always possible to make the statement that either X y or y >x
Assumptions about Preference Relations Completeness: For any two bundles x and y it is always possible to make the statement that either x y or y x. ~ f ~ f

Assumptions about Preference Relations Reflexivity: Any bundle x is always at least as preferred as itself; i.e x >x
Assumptions about Preference Relations Reflexivity: Any bundle x is always at least as preferred as itself; i.e. x x. ~ f

Assumptions about Preference Relations Transitivity: If X is at least as preferred as y, and y is at least as preferred as z, then x is at least as preferred as z; i.e. x y andy >z→x
Assumptions about Preference Relations Transitivity: If x is at least as preferred as y, and y is at least as preferred as z, then x is at least as preferred as z; i.e. x y and y z x z. ~ f ~ f ~ f

Indifference Curves 无差是的线(或无差异 Take a reference bundle x the set of all bundles equally preferred to x is the indifference curve containing X', the set of all bundles y oX Since an indifference“ curve” is not always a curve a better name might be an indifference“set
Indifference Curves 无差异曲线 (或,无差异集) Take a reference bundle x’. The set of all bundles equally preferred to x’ is the indifference curve containing x’; the set of all bundles y ~ x’. Since an indifference “curve” is not always a curve a better name might be an indifference “set
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