Micro Economic

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2 Penawaran dan Permintaan I:Bagaimana Pasar Bekerja

Transcript of Micro Economic

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Penawaran dan Permintaan I:Bagaimana Pasar Bekerja

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Kekuatan Pasar Atas Penawaran Dan Permintaan

• Penawaran dan permintaan adalah dua kata yang paling sering digunakan oleh ekonom.

• Penawaran dan permintaan adalah kekuatan yang membuat pasar bekerja.

• Mikroekonomi modern adalah tentang penawaran, prmintaan, dan keseimbangan pasar.

• Pasar adalah sekelompok pembeli dan penjual daripada barang dan jasa.

• Penwaran dan permintaan berhubungan dengan tingkah laku manusia sebagaimana mereka berinteraksi dalam pasar.

PASAR DAN PERSAINGAN

MARKETS AND COMPETITION

• Pembeli pasti berhubungan dengan permintaan.

• Penjual pasti berhubungan dengan penawaran.

Competitive Markets

• Pasar yang kompetitif adalah pasar dimana ada banyak penjual dan pembeli yang dapat mempengaruhi harga pasar.

• Kompetisi sempurna– Produk sama– Jumlah pembeli dan penjual yang banyak sehingga

tiap-tiapnya tidak mempunyai pengaruh terhadap harga.

– Pembeli dan penjual adalah pengatur harga.• Monopoli– Satu penjual, dan penjual yang menentukan harga.

Competition: Perfect and Otherwise

• Oligopoli– Sedikit penjual.– Tidak selalu merupakan kompetisi yang agresif.

• Kompetisi monopoli– Banyak penjual.– Sedikit perbedaan produk.– Setiap penjual dapat menentukan harga

produknya.

Competition: Perfect and Otherwise

PERMINTAAN

• Kuantitas permintaan adalah jumlah barang yang ingin dan mampu di beli oleh pembeli.

• Hukum permintaan“Hukum permintaan menyatakan, permintaan terhadap barang akan turun apabila harga naik”.

The Demand Curve: The Relationship between Price and Quantity Demanded

• Tabel Permintaan– Tabel permintaan adalah tabel yang

menggambarkan hubungan antara harga barang dengan kuantitas permintaan.

Catherine’s Demand Schedule

The Demand Curve: The Relationship between Price and Quantity Demanded

• Kurva permintaan– Kurva permintaan adalah grafik hubungan antara

harga barang dengan kuantitas permintaan.

Figure 1 Catherine’s Demand Schedule and Demand Curve

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Price ofIce-Cream Cone

0

2.50

2.00

1.50

1.00

0.50

1 2 3 4 5 6 7 8 9 10 11 Quantity ofIce-Cream Cones

$3.00

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1. A decrease in price ...

2. ... increases quantity of cones demanded.

Market Demand versus Individual Demand

• Pasar permintaan menjelaskan jumlah permintaan setiap individu terhadap sejumlah barang.

• Graphically, individual demand curves are summed horizontally to obtain the market demand curve.

Shifts in the Demand Curve

• Perubahan Kuantitas Permintaan– Pergerakan di sepanjang kurva permintaan.– Dikarenakan perubahan harga dari produk.

0

D

Price of Ice-Cream Cones

Quantity of Ice-Cream Cones

A tax that raises the price of ice-cream cones results in a movement along the

demand curve.

A

B

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1.00

$2.00

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Perubahan Jumlah Permintaan

Pergeseran Kurva Permintaan Curve

• Pendapatan Konsumen• Harga terhadap barang• Selera• Perkiraan• Jumlah pembeli

S Pergeseran Kurva Permintaan and Curve

• Perubahan Permintaan– Pergeseran kurva permintaan dapat bergeser ke

kiri ataupun ke kanan.– Dikarenakan perubahan jumlah permintaan pada

setiap tingkat harga.

Figure 3 Shifts in the Demand Curve

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Price ofIce-Cream

Cone

Quantity ofIce-Cream Cones

Increasein demand

Decreasein demand

Demand curve, D3

Demandcurve, D1

Demandcurve, D2

0

Shifts in the Demand Curve

• Pendapatan Konsumen– Ketika pendapatan meningkat maka permintaan

akan barang normal juga akan meningkat.– Ketika pendapatan meningkat maka permintaan

akan barnag infeerior akan menurun.

$3.002.50

2.001.501.00

0.50

21 3 4 5 6 7 8 9 10 1211

Price of Ice-Cream Cone

Quantity of Ice-Cream Cones

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Increasein demand

An increase in income...

D1D2

Consumer IncomeNormal Good

$3.002.50

2.001.501.00

0.50

21 3 4 5 6 7 8 9 10 1211

Price of Ice-Cream Cone

Quantity of Ice-Cream

Cones0

Decreasein demand

An increase in income...

D1D2

Consumer IncomeInferior Good

Shifts in the Demand Curve

• Harga Barang– Ketika harga suatu barang jatuh dan mengurangi

permintaan akan barang lain, maka kedua benda tersebut disebut barang subtitusi.

– Ketika harga suatu barng jatuh dan meningkatkan permintaan akna barang lain maka kedua barang tersebut disebut pelengkap(complement).

Table 1 Variables That Influence Buyers

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Penawaran

• Kuantitas Penawaran adalah jumlah barang yang dapat akan dan dapat dijual oleh penjual.

• Hukum Penawaran– Hukum Penawaran menyatakan penawaran akan

suatu barang akan meningkat ketika harga suatu barang meningkat.

The Supply Curve: The Relationship between Price and Quantity Supplied

• Supply Schedule– Supply schedule adalah tabel yang menunjukan

hubungan harga barang terhadap jumlah permintaan.

Ben’s Supply Schedule

The Supply Curve: The Relationship between Price

and Quantity Supplied • Kurva Penawaran– Kurva penawaran adalah grafik hubungan antara

harga barang terhadap jumlah penawaran.

Figure 5 Ben’s Supply Schedule and Supply Curve

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Price ofIce-Cream

Cone

0

2.50

2.00

1.50

1.00

1 2 3 4 5 6 7 8 9 10 11 Quantity ofIce-Cream Cones

$3.00

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0.50

1. Anincrease in price ...

2. ... increases quantity of cones supplied.

Market Supply versus Individual Supply

• Market supply refers to the sum of all individual supplies for all sellers of a particular good or service.

• Graphically, individual supply curves are summed horizontally to obtain the market supply curve.

Shifts in the Supply Curve

• Input prices• Technology• Expectations • Number of sellers

Shifts in the Supply Curve

• Change in Quantity Supplied– Movement along the supply curve.– Caused by a change in anything that alters the

quantity supplied at each price.

1 5

Price of Ice-Cream Cone

Quantity of Ice-Cream Cones0

S

1.00A

C$3.00 A rise in the price of

ice cream cones results in a

movement along the supply curve.

Change in Quantity Supplied

Shifts in the Supply Curve

• Change in Supply– A shift in the supply curve, either to the left or

right. – Caused by a change in a determinant other than

price.

Figure 7 Shifts in the Supply Curve

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Price ofIce-Cream

Cone

Quantity ofIce-Cream Cones

0

Increasein supply

Decreasein supply

Supply curve, S3

curve, Supply

S1Supply

curve, S2

Table 2 Variables That Influence Sellers

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SUPPLY AND DEMAND TOGETHER

• Equilibrium refers to a situation in which the price has reached the level where quantity supplied equals quantity demanded.

SUPPLY AND DEMAND TOGETHER

• Equilibrium Price– The price that balances quantity supplied and

quantity demanded. – On a graph, it is the price at which the supply and

demand curves intersect.• Equilibrium Quantity– The quantity supplied and the quantity demanded

at the equilibrium price. – On a graph it is the quantity at which the supply

and demand curves intersect.

At $2.00, the quantity demanded is equal to the quantity supplied!

SUPPLY AND DEMAND TOGETHERDemand Schedule

Supply Schedule

Figure 8 The Equilibrium of Supply and Demand

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Price ofIce-Cream

Cone

0 1 2 3 4 5 6 7 8 9 10 11 12Quantity of Ice-Cream Cones

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Equilibriumquantity

Equilibrium price Equilibrium

Supply

Demand

$2.00

Figure 9 Markets Not in Equilibrium

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Price ofIce-Cream

Cone

0

Supply

Demand

(a) Excess Supply

Quantitydemanded

Quantitysupplied

Surplus

Quantity ofIce-Cream

Cones

4

$2.50

10

2.00

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Equilibrium

• Surplus– When price > equilibrium price, then quantity

supplied > quantity demanded. • There is excess supply or a surplus. • Suppliers will lower the price to increase sales, thereby

moving toward equilibrium.

Equilibrium

• Shortage– When price < equilibrium price, then quantity

demanded > the quantity supplied. • There is excess demand or a shortage. • Suppliers will raise the price due to too many buyers

chasing too few goods, thereby moving toward equilibrium.

Figure 9 Markets Not in Equilibrium

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Price ofIce-Cream

Cone

0 Quantity ofIce-Cream

Cones

Supply

Demand

(b) Excess Demand

Quantitysupplied

Quantitydemanded

1.50

10

$2.00

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Shortage

Equilibrium

• Law of supply and demand– The claim that the price of any good adjusts to

bring the quantity supplied and the quantity demanded for that good into balance.

Three Steps to Analyzing Changes in Equilibrium

• Decide whether the event shifts the supply or demand curve (or both).

• Decide whether the curve(s) shift(s) to the left or to the right.

• Use the supply-and-demand diagram to see how the shift affects equilibrium price and quantity.

Figure 10 How an Increase in Demand Affects the Equilibrium

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Price ofIce-Cream

Cone

0 Quantity of Ice-Cream Cones

Supply

Initialequilibrium

D

D

3. . . . and a higherquantity sold.

2. . . . resultingin a higherprice . . .

1. Hot weather increasesthe demand for ice cream . . .

2.00

7

New equilibrium$2.50

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Three Steps to Analyzing Changes in Equilibrium

• Shifts in Curves versus Movements along Curves– A shift in the supply curve is called a change in

supply.– A movement along a fixed supply curve is called a

change in quantity supplied.– A shift in the demand curve is called a change in

demand.– A movement along a fixed demand curve is called

a change in quantity demanded.

Figure 11 How a Decrease in Supply Affects the Equilibrium

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Price ofIce-Cream

Cone

0 Quantity of Ice-Cream Cones

Demand

Newequilibrium

Initial equilibrium

S1

S2

2. . . . resultingin a higherprice of icecream . . .

1. An increase in theprice of sugar reducesthe supply of ice cream. . .

3. . . . and a lowerquantity sold.

2.00

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$2.50

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Table 4 What Happens to Price and Quantity When Supply or Demand Shifts?

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Summary

• Economists use the model of supply and demand to analyze competitive markets.

• In a competitive market, there are many buyers and sellers, each of whom has little or no influence on the market price.

Summary

• The demand curve shows how the quantity of a good depends upon the price.– According to the law of demand, as the price of a

good falls, the quantity demanded rises. Therefore, the demand curve slopes downward.

– In addition to price, other determinants of how much consumers want to buy include income, the prices of complements and substitutes, tastes, expectations, and the number of buyers.

– If one of these factors changes, the demand curve shifts.

Summary

• The supply curve shows how the quantity of a good supplied depends upon the price.– According to the law of supply, as the price of a

good rises, the quantity supplied rises. Therefore, the supply curve slopes upward.

– In addition to price, other determinants of how much producers want to sell include input prices, technology, expectations, and the number of sellers.

– If one of these factors changes, the supply curve shifts.

Summary

• Market equilibrium is determined by the intersection of the supply and demand curves.

• At the equilibrium price, the quantity demanded equals the quantity supplied.

• The behavior of buyers and sellers naturally drives markets toward their equilibrium.

Summary

• To analyze how any event influences a market, we use the supply-and-demand diagram to examine how the even affects the equilibrium price and quantity.

• In market economies, prices are the signals that guide economic decisions and thereby allocate resources.