chapter 3: demand and supply. barter vs. monetary economy barter – goods are traded directly for...
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Chapter 3: Demand and Supply
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Barter vs. monetary economy Barter – goods are traded directly
for other goods Problems:
requires double coincidence of wants large number of trading ratios: N(N-
1)/2 (high information costs) Monetary economy has lower
transaction and information costs
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Relative and nominal prices Relative price = price of a good in
terms of another good Nominal price = price expressed in
terms of the monetary unit Relative price is a more direct
measure of opportunity cost
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Markets In a market economy, the price of
a good is determined by the interaction of demand and supply
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Demand A relationship between price and
quantity demanded in a given time period, ceteris paribus.
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Demand schedule
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Demand curve
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Law of demand An inverse relationship exists
between the price of a good and the quantity demanded in a given time period, ceteris paribus.
Reasons: substitution effect income effect
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Change in quantity demanded vs. change in demand
Change in quantity demanded Change in demand
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Market demand curve Market demand is the horizontal
summation of individual consumer demand curves
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Determinants of demand tastes and preferences prices of related goods and
services income number of consumers expectations of future prices and
income
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Tastes and preferences Effect of fads:
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Prices of related goods substitute goods – an increase in
the price of one results in an increase in the demand for the other.
complementary goods – an increase in the price of one results in a decrease in the demand for the other.
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Change in the price of a substitute good Price of coffee rises:
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Change in the price of a complementary good Price of DVDs rises:
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Income and demand: normal goods A good is a normal good if an increase
in income results in an increase in the demand for the good.
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Income and demand: inferior goods A good is an inferior good if an
increase in income results in a reduction in the demand for the good.
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Demand and the # of buyers An increase in the number of buyers
results in an increase in demand.
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Expectations A higher expected future price will
increase current demand. A lower expected future price will
decrease current demand. A higher expected future income will
increase the demand for all normal goods.
A lower expected future income will reduce the demand for all normal goods.
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International effects exchange rate – the rate at which
one currency is exchanged for another.
currency appreciation – an increase in the value of a currency relative to other currencies.
currency depreciation – a decrease in the value of a currency relative to other currencies.
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International effects (continued) Domestic currency appreciation causes
domestically produced goods and services to become more expensive in foreign countries.
An increase in the exchange value of the U.S. dollar results in a reduction in the demand for U.S. goods and services.
The demand for U.S. goods and services will rise if the U.S. dollar depreciates.
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Supply the relationship that exists between the
price of a good and the quantity supplied in a given time period, ceteris paribus.
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Supply schedule
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Law of supply A direct relationship exists
between the price of a good and the quantity supplied in a given time period, ceteris paribus.
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Reason for law of supply The law of supply is the
result of the law of increasing cost. As the quantity of a good
produced rises, the marginal opportunity cost rises.
Sellers will only produce and sell an additional unit of a good if the price rises above the marginal opportunity cost of producing the additional unit.
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Change in supply vs. change in quantity supplied
Change in supply Change in quantity supplied
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Individual firm and market supply curves The market supply curve is the
horizontal summation of the supply curves of individual firms. (This is equivalent to the relationship between individual and market demand curves.)
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Determinants of supply the price of resources, technology and productivity, the expectations of producers, the number of producers, and the prices of related goods and
services note that this involves a relationship
in production, not in consumption
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Price of resources As the price of a resource rises,
profitability declines, leading to a reduction in the quantity supplied at any price.
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Technological improvements Technological improvements (and any
changes that raise the productivity of labor) lower production costs and increase profitability.
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Expectations and supply An increase in the expected future
price of a good or service results in a reduction in current supply.
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Increase in # of sellers
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Prices of other goods Firms produce and sell more than one
commodity. Firms respond to the relative
profitability of the different items that they sell.
The supply decision for a particular good is affected not only by the good’s own price but also by the prices of other goods and services the firm may produce.
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International effects Firms import raw materials (and often
the final product) from foreign countries. The cost of these imports varies with the exchange rate.
When the exchange value of a dollar rises, the domestic price of imported inputs will fall and the domestic supply of the final commodity will increase.
A decline in the exchange value of the dollar raises the price of imported inputs and reduce the supply of domestic products that rely on these inputs.
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Market equilibrium
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Price above equilibrium If the price exceeds the equilibrium
price, a surplus occurs:
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Price below equilibrium If the price is below the equilibrium
a shortage occurs:
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Demand rises
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Demand falls
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Supply rises
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Supply falls
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Price ceiling Price ceiling - legally mandated
maximum price Purpose: keep price below the
market equilibrium price Examples:
rent controls price controls during wartime gas price rationing in 1970s
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Price ceiling (continued)
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Price floor price floor - legally mandated
minimum price designed to maintain a price above
the equilibrium level examples:
agricultural price supports minimum wage laws
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Price floor (continued)