ECON 101 Study Guide - Final Guide: Ceteris Paribus, Inverse Relation, Marginal Cost

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Microeconomics Final Exam Review List
Chapter 1
Scarcity- limited resources with unlimited wants
1) land
2) labor
3) capital
Economics- study of how society manages its scarce resources
-decision making
- individuals
- firms
- society
Opportunity Cost- (next best choice)
- tradeoff
- cost of something is what you give up to get it
- every choice requires a tradeoff
- highest valued foregone alternative
Marginal Decision Making- (extra)
- Rational people think at the margin
- respond to incentives
- compare marginal benefits to the marginal costs of the decision
- when marginal benefit exceeds marginal cost (just do it!!!), when marginal cost exceeds
marginal benefit
- incentives change the cost or benefit dealing with a choice
Chapter 2
Supply: relationship between the price of a good and the quantity that sellers make available for sale
Factors
1) price
-usually there is a positive relation between price and quantity supplied ( Price goes up,
supplied goes up, vice versa)
- exceptions: fixed supply- a set quantity exists regardless of price
2) input prices
-prices of resources needed to produce the good
-input price rises, supply decreases
- input price falls, supply increases
3) technology
- technology advance increases supply
PPF (production possibilities frontier): a graph that shows the possible combinations of goods that
can be produced with given resources
- 2 goods
- fixed resources and technology
- graph bowed outward
Not feasible/possible points-
- Not feasible (outside): not possible, do not have resources for that combination
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- possible (inside): possible but inefficient, have unemployed resources
Opportunity Cost
Chapter 4
Demand: the relationship between the price of a good and the quantity that buyers are willing and
able to purchase.
Law of Demand: inverse relation between price and quantity demanded, ceteris paribus (holding all
factors constant) P goes up, demand goes down, price goes down, and demand goes up
Factors for supply
price
input prices
technology
government
expectations
# of sellers
6) number of sellers
-market supply → sum of all sellers
- number of sellers rises/falls, supply increases/decreases
Supply and Demand
Equilibrium: Quantity demanded= quantity supplied
Shortage: demand exceeds supply
When a shortage exists the following drives the market toward equilibrium: Price must rise,
buyers begin to bid up the price to obtain the good, as price rises, quantity demanded falls, quantity
supplied rises and the shortage gets smaller until market obtains equilibrium
Surplus: supply exceeds demand
When a surplus exists the following drives the market down toward equilibrium: Price must
fall, sellers begin to reduce price to eliminate excess supply, as price falls, quantity demanded rises,
quantity supplied falls and the surplus gets smaller until market obtains equilibrium
Analysis
Chapter 5: Elasticity
Elasticity measure of responsiveness or sensitivity
Price Elasticity of Demand: measures the responsiveness of buyers to the change in price of the good
- price goes up, Q demand goes down, elasticity measures by how much Q falls
Determinants
Necessity v. luxury
-necessity: more inelastic
- luxury: more elastic
Number if Substitutes
-few substitutes→ more inelastic
- many substitutes→ more elastic
Portion of budget
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Document Summary

Microeconomics final exam review list: land, labor, capital. Cost of something is what you give up to get it. Compare marginal benefits to the marginal costs of the decision. When marginal benefit exceeds marginal cost (just do it!!! Economics- study of how society manages its scarce resources. Supply: relationship between the price of a good and the quantity that sellers make available for sale. Ppf (production possibilities frontier): a graph that shows the possible combinations of goods that can be produced with given resources. Exceptions: fixed supply- a set quantity exists regardless of price: input prices. Prices of resources needed to produce the good. Input price falls, supply increases: technology. Not feasible (outside): not possible, do not have resources for that combination. Incentives change the cost or benefit dealing with a choice: price. Usually there is a positive relation between price and quantity supplied ( price goes up, Possible (inside): possible but inefficient, have unemployed resources.

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