2.1A Supply and Demand Model...• Demand is determined by the buyers of a good. Buyer always want...
Transcript of 2.1A Supply and Demand Model...• Demand is determined by the buyers of a good. Buyer always want...
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2.1A Supply and Demand Model
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What are competitive markets?CompetitiveMarkets:
– Bringtogetherthedecentralizeddecisionsofbuyersandsellers– DecentralizedDecisionsofBuyers:
• Drivethemtotrytogetthelowestpossiblepriceforthegoodstheywant
– DecentralizedDecisionsofSellers:• Drivethemtotrytogetthehighestpossiblepriceforthegoodstheyareselling
Whenthesedecisionscometogether– competitivemarketsyield:– Bestpossiblepricefortheproduct– Producedatthelowestpossiblecost– Mostefficientallocationofresources
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What are competitive markets?CompetitiveMarkets:
– Bringtogetherthedecentralizeddecisionsofbuyersandsellers– DecentralizedDecisionsofBuyers:
• Drivethemtotrytogetthelowestpossiblepriceforthegoodstheywant
– DecentralizedDecisionsofSellers:• Drivethemtotrytogetthehighestpossiblepriceforthegoodstheyareselling
Whenthesedecisionscometogether– competitivemarketsyield:– Bestpossiblepricefortheproduct– Producedatthelowestpossiblecost– Mostefficientallocationofresources
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What are competitive markets?FundamentalAssumptionsofSupply+DemandModel:
1.OperatingunderPerfectCompetition• Lotsofbuyersandsellers• Goodssoldareidentical• Nocosttoenteringorleavingthemarket
2.Equalaccesstoinformation3.Externalitiesdonotexist
Nosingleeconomicagentcanunilaterallyexertanypricecontrol
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What are competitive markets?FundamentalAssumptionsofSupply+DemandModel:
1.OperatingunderPerfectCompetition• Lotsofbuyersandsellers• Goodssoldareidentical• Nocosttoenteringorleavingthemarket
2.Equalaccesstoinformation3.Externalitiesdonotexist
Nosingleeconomicagentcanunilaterallyexertanypricecontrol
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What are competitive markets?FundamentalAssumptionsofSupply+DemandModel:
1.OperatingunderPerfectCompetition• Lotsofbuyersandsellers• Goodssoldareidentical• Nocosttoenteringorleavingthemarket
2.Equalaccesstoinformation3.Externalitiesdonotexist
Nosingleeconomicagentcanunilaterallyexertanypricecontrol
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What is Demand?
• Demandcomesfromthebuyerofagood/service
• Eachbuyeristryingtogetthelowestpricepossibleforthegood/servicethattheywantQuantityDemanded:Amountofthe
goodbuyerswanttobuyateachpricepoint
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What is Demand?
DemandSchedule:givesthequantitydemandedateachprice
Price QuantityDemanded
$5 13$6 12$7 10
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What is Demand?• Fromthedemandschedule,wecandeterminethedemand
curve
• DemandCurve:Relationshipbetweenpriceofthegoodandamountpeoplewanttobuyofthegood(quantitydemanded)
• LawofDemand:Aspriceofagooddeclines,peoplewanttobuymoreofit
Qdemanded
Price
Demand
$7
$6
$5
101213
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Changes in DemandMovementalongthedemandcurve:• Priceofthegoodhaschangedbutthereisnochangeinthe
willingnessofbuyerstobuythegood
• Pricechanges– movetoanewpointonthedemandcurve(fromAtoB)
Qdemanded
Price
Demand
$7
$5
1013
A
B
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Changes in DemandShiftinthedemandcurve:• Somefactorhaschangedthatdirectlyimpactsbuyers’
willingnesstobuythegood
• Demandcurveshifts– ateachpricepointthereisnowanewquantitydemanded
Qdemanded
Price
D.1
$7
1015
A B
D.2
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Factors that Shift Demand1.ChangeinIncome
• NormalGoodsSallyjustreceivedaraiseatwork.ShenowbuysStarbuck’s
lattesonherwaytowork.
• InferiorGoodsAfterreceivingherraise,Sallynolongerbuyscoffeeatthegas
stationonherwaytowork.
Qdemanded
Priceoflattes
D.1
$4.50
01
A
D.2
B
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Factors that Shift Demand2.ChangeinPriceofRelatedGoods
• Compliments:Goodsthatareconsumedtogether• Ifthepriceofhotdogsincreases,peoplewilldemand(orbuy)lesshotdogbuns
• PriceofGoodAincreases:DemandforGoodBdecreases• PriceofGoodAdecreases:DemandforGoodBincreases
Qdemanded
PriceofHotDogBuns
D.1
$1.50
56D.2
AB
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Factors that Shift Demand2.ChangeinPriceofRelatedGoods
• Substitutes: Goodsthatcanbeconsumedintheplaceofanothergood
• Ifthepriceofhotdogsincreases,peoplewilldemand(orbuy)morehamburgers
• PriceofGoodAincreases:DemandforGoodBincreases• PriceofGoodAdecreases:DemandforGoodBdecreases
Qdemanded
PriceofHamburgers
$4.00
78
BA
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Factors that Shift Demand3.ChangeinTastesandPreferences
Asitgetscolderoutinthewintermonths,peopleprefer tobuysweatersandjackets.Demandforsweaters increases.4.ChangeinNumberofBuyers
Aslaptopsbecomemorepopularandeasytouse,morepeoplebuythem.Demandforlaptopsincreases.5.ChangeinFutureExpectations
FuturePriceoftheGood:Ifpeopleexpectdiscountedpricesduetoretailersholidaysales,theywillwaittobuythegoods
FutureIncome:Ifacollegestudentsecuresajobthathewillstartinafewmonths,hewillfeelmoreconfidentbuyinganexpensivesuittoday.
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What is Supply?
• Supply comes from the seller of a good/service
• Each seller is trying to get the highest price possible for the good/service that they produce
• Quantity Supplied: Amount of the good sellers are willing to sell at each price point
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What is Supply?
SupplySchedule:givesthequantitysuppliedateachprice
Price QuantitySupplied
$5 10$6 12$7 13
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What is Supply?• Fromthesupplyschedule,wecandeterminethesupplycurve
• SupplyCurve:Relationshipbetweenpriceofthegoodandamountfirmsarewillingtosellofthegood(quantitysupplied)
• LawofSupply:Aspriceofagoodincreases,peoplewanttosellmoreofit
Qsupplied
Price Supply
$7
$6
$5
101213
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Changes in SupplyMovementalongthesupplycurve:• Priceofthegoodhaschangedbutthereisnochangeinthe
costofproductionorwillingnesstosellbythefirm
• Pricechanges– movetoanewpointonthesupplycurve(fromAtoB)
Qsupplied
PriceSupply
$7
$5
1013
B
A
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Changes in SupplyShiftinthesupplycurve:• Somefactorhaschangedthatdirectlyimpactssellers’
willingnesstosell/producethegood(or)theircostofproduction
• Supplycurveshifts– ateachpricepointthereisnowanewquantitysupplied
Qsupplied
Price S.1
$7
1015
A B
S.2
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Factors that Shift Supply1. ChangeinPriceofInputs
Ifthepriceofwoodincreases,thecostofproducingtableswouldincrease.Supplywoulddecrease ateachpricepoint.
Qsupplied
S.2
$100
100150
B A
PriceofTables S.1
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Factors that Shift Supply2.ChangeinProductionTechnology
Thereplacementofworkerswithrobotsincarproduction.Supplyincreasesateachpricepoint.
3.ChangeinNumberofSellersMoresellersmeansmoreproductionateachpricepoint.Supplyincreases.
4.ChangeInFutureExpectationsFuturePriceoftheGood:Expectpricetoriseinthefuture– produce/sell
morethenFuturePriceofInputs:Expectinputstobemoreexpensive– produce/sell
moretoday
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Key Takeaway• Demandisdeterminedbythebuyersofagood.Buyeralwayswanttogetthelowestpricetheycan!Hence,demandisdownwardsloping
• Supplyisdeterminedbythesellersofthegood.Sellersalwayswanttogetthehighestpricetheycan!Hence,supplyisupwardsloping
• Certainfactorsaffecteachofthecurvesandcausethemtoshift.Theshiftscomefromanunderlyingchangetothe“willingnesstobuy”or“willingnesstosell”.
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2.1B Supply, Demand and Market Equilibrium
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Market Equilibrium
Supply
Demand
Quantity
Price
P*
Q*
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Market Equilibrium
Supply
Demand
Quantity
Price
P*
Qd Qs
P
SURPLUS
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Market Equilibrium
Supply
Demand
Quantity
Price
P*
Qd Qs
P
SHORTAGE
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Test your UnderstandingConsiderthemarketfororanges.Drawoutthesupplyanddemandcurvesbasedonthefollowingsupplyanddemandschedule:
1. Drawoutthesupplyanddemandcurvesbasedonthisinformation.Whereistheequilibriumpriceandquantity?
2. SupposethereisanexceptionallycoldwinterinFloridawithfrostsruiningmanygroves.Whathappenstothismarket?Illustrateandexplain.
3. Whathappensifthepriceofapplesfalls?Illustrateandexplain.4. Whatifbothscenarioshappensimultaneously?
Price QD QS
$5 10 50
$4 20 40
$3 30 30
$2 40 20
$1 50 10
$0 60 0
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Test your Understanding1. Drawoutthesupplyanddemandcurvesbasedonthisinformation.Where isthe
equilibriumpriceandquantity?
Supply
DemandQuantity
Price
$3
30
A
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Test your Understanding2.Suppose there isanexceptionallycoldwinter inFloridawithfrosts ruiningmanygroves.Whathappens tothismarket? Illustrate.
S.1
DemandQuantity
Price
$3
30
A
S.2
B$4
25
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Test your Understanding3.Whathappensifthepriceofapplesfalls?Illustrateandexplain.
S.1
D.1Quantity
Price
$3
30
A
D.2
B’$2
25
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Test your Understanding4.Whatifbothscenarioshappensimultaneously?
S.1
D.1
Quantity
Price
$3
30
A
D.2
B'
10
S.2
B
C
Definitedecreaseinequilibriumquantity
Ambiguouschangeinequilibrium
price
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Simultaneous Shifts in Both CurvesSIMULTANEOUS
SHIFTS DemandIncreases
SupplyIncreases
AmbiguousEffectonPrice
QuantityIncreases
S.1
D.1Quantity
Price
Q.1
A
D.2
B
Q.2
S.2
Inthemarketforsweaters:- Winteriscomingandit’sgoingtobeacoldone!(IncreaseinDemand)
- Woolbecomescheaper(IncreaseinSupply)
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Simultaneous Shifts in Both Curves
SIMULTANEOUSSHIFTS DemandIncreases
SupplyDecreases
Priceincreases
AmbiguousEffectonQuantity
S.1
D.1Quantity
Price
P.1 AD.2
BP.2
S.2
Inthemarketforcoffee:- FDAsayscoffeecanhelppeoplestayhealthy(IncreaseinDemand)
- AdroughtinEcuadordestroysthecoffeecrops(DecreaseinSupply)
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Simultaneous Shifts in Both Curves
SIMULTANEOUSSHIFTS DemandDecreases
SupplyDecreases
AmbiguousEffectonPrice
QuantityDecreases
S.1
D.1
Quantity
Price
Q.1
A
D.2
B
Q.2
S.2
Inthemarketforsnowboards:- Skiinggearisnowcheaperthansnowboardinggear(DecreaseinDemand)
- Afewmajorproducersofsnowboardsdecidetoshifttheirbusinessfocustootherproducts(DecreaseinSupply)
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Simultaneous Shifts in Both CurvesSIMULTANEOUS
SHIFTS DemandDecreases
SupplyIncreases
Pricedecreases
AmbiguousEffectonQuantity
S.1
D.1
Quantity
Price
P.1A
D.2
BP.2
S.2
Inthemarketforelectriccars:- Gaspricesfall,peopleprefertokeeptheiroldcars(DecreaseinDemand)
- Innovationsinproductionmakeitcheaperforcompaniestomakeelectriccars(IncreaseinSupply)
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Key Takeaway
•MarketEquilibriumbringstogetherthedecentralizeddecisionsofbuyersandsellers• Becauseeachagentislookingoutfortheirownbestinterest– wegettheoptimalresultsinthemodel• ShiftsintheSorDcurvemustcomefromachangeinoneofthefactorsthatchangeeither“willingnesstosell”or“willingnesstobuy”• S-DGraphiscriticalinhelpingusfindequilibriumandanalyze/understandchangesinthemarket.
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PrinciplesofMicroeconomicsModule2.1(C)
PriceControls
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• Inthisvideo,wewilldiscusswhathappenswhenthegovernmentimposesapricecontrolinamarket.Wewillseehowthisdistortstheequilibriumoutcomesinthesupplyanddemandmodel
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PriceControlsIneconomics,weargue:• Bestpossibleoutcomesoccurwithnogov’tinterference• Yieldsmostefficientallocationofresources• Whenpoliciestocontrolthepriceinterfereinthemarket,theycreatedistortions
Thesedistortions cause:• Shortages• Surpluses
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WhatarePriceControls?
Pricecontrols• Settingapricemaximum(priceceiling)orpriceminimum(pricefloor)inagivenmarket
• Non-bindingpricecontrol:theequilibriumisnotdistortedandthemarketoutcomesareefficient
• Bindingpricecontrol:theequilibriumcannotbereachedandthemarketoutcomesareinefficient(shortageorsurplus)
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WhatarePriceControls?
Pricecontrols• Settingapricemaximum(priceceiling)orpriceminimum(pricefloor)inagivenmarket
• Non-bindingpricecontrol:theequilibriumisnotdistortedandthemarketoutcomesareefficient
• Bindingpricecontrol:theequilibriumcannotbereachedandthemarketoutcomesareinefficient(shortageorsurplus)
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WhatarePriceControls?
Pricecontrols• Settingapricemaximum(priceceiling)orpriceminimum(pricefloor)inagivenmarket
• Non-bindingpricecontrol:theequilibriumisnotdistortedandthemarketoutcomesareefficient
• Bindingpricecontrol:theequilibriumcannotbereachedandthemarketoutcomesareinefficient(shortageorsurplus)
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TestyourUnderstandingConsidertwolabormarkerswherealawyer’swagerateisapproximately$100/hr andahousecleaner’swagerateisapproximately$8/hr.• Thegovernmentdecidestoimposeaminimumwagelawof$12/hr.
1. Whatimpactdoesthishaveonthemarketforlawyers?Drawoutthesupplyanddemandmodel.
2. Whatimpactdoesthishaveonthemarketforhousecleaners?Drawoutthesupplyanddemandmodel.
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MinimumWageLaws
Q
PP
Q
MarketforLawyers MarketforHousecleaners
70
$100
$8
S
D
S
D
MarketEquilibrium
MarketEquilibrium
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MinimumWageLaws
Q
PP
Q
MarketforLawyers MarketforHousecleaners
71
$100
$8
S
D
S
D
PriceFloorMin.Wage
PriceFloorMin.Wage
$12 $12
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MinimumWageLaws
Q
PP
Q
MarketforLawyers MarketforHousecleaners
72
$100
$8
S
D
S
D
PriceFloorMin.Wage
PriceFloorMin.Wage
$12 $12
Qd =Qs Qd Qs
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MinimumWageLaws
Q
PP
Q
MarketforLawyers MarketforHousecleaners
73
$100
$8
S
D
S
D
PriceFloorMin.Wage
PriceFloorMin.Wage
$12 $12
Qd =Qs Qd Qs
Qd =Qs:Noeffectofthemarketforlawyers
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MinimumWageLaws
Q
PP
Q
MarketforLawyers MarketforHousecleaners
74
$100
$8
S
D
S
D
PriceFloorMin.Wage
PriceFloorMin.Wage
$12 $12
Qd =Qs Qd Qs
Qd <Qs:At$12:SurplusofHousecleaners
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KeyTakeaways• Governmentpoliciescancausedistortionsinthemarketforgoodsandservicesbypreventingsupplyanddemandtoreachequilibrium
• Thesedistortionscreate• Shortages• Surpluses• Mismatchbetweenpricesforbuyersandsellers
• Policiesareputinplacemanytimesduetothesocialbenefitsoutweighingtheeconomiccosts
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Principles of MicroeconomicsModule 2.2 (A)
Price Elasticity of Demand and Supply
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Ways that Demand and Supply ChangeChangesindemandandsupplycomefrom:– Movementalongthecurve– somefactorchangesthat
doesnotdirectlyaffectthewillingnessofbuyertopayorsellertosell
– Shiftinthecurve– somefactorchangesthatdirectlyaffects thewillingnessofbuyertopayorsellertosell
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PriceElasticity
PriceElasticityofDemand:• ByhowmuchdoesQdrespondtoapricechange?
• MovementalongthedemandcurvefromAtoB
• Responsivenessofquantitydemandedtopricechange
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PriceElasticityPriceElasticityofSupply:• ByhowmuchdoesQsrespondtoapricechange?
• MovementalongthesupplycurvefromAtoB
• Responsivenessofquantitysuppliedtopricechange
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Midpoint Method for Price Elasticity•
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Elasticity of CurvesAnychangeinpriceyieldsalargeresponse/adjustment inquantitydemanded:- Luxurygoods:designer jeansà notanecessity
- Gourmetfoods:$15/lbcheeseà manysubstitutes
- KitKatbarsà manysubstitutes
Pa
Pb
Qa Qb
P
Q
ElasticDemand
A
B
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Elasticity of Curves
Changeinpriceyieldsasmallresponse/adjustmentinquantitydemanded:
- Medicine- Food- Peakrailroadtickets
Pa
Pb
Qa Qb
P
Q
InelasticDemand
A
B
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Elasticity of CurvesChangeinpriceyieldsalargeresponse/adjustmentinquantitysupplied:
• Firmoperatingbelowcapacity
Anychangeinprice– thefirmwillquicklyadjustproduction
Pb
Pa
Qa Qb
P
Q
ElasticSupply
B
A
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ElasticityofCurvesChangeinpriceyieldsasmallresponse/adjustmentinquantitysupplied:
• Agricultureintheshorttermcan’timmediatelyproducemore
• Nuclearpower
Pb
Pa
Qa Qb
P
Q
InelasticSupply
A
B
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PrinciplesofMicroeconomicsModule2.2(B)
PriceElasticityofDemandandSupply
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Price Elasticity of DemandSupposeagrocerystoreownerisdecidingtoincreasethepriceofsmokedsalmonby10%from$11.00to$12.10.Thequantityofsmokesalmonhecansellfallsfrom40unitsto25units.• Whatisthepriceelasticityofdemandforsmokedsalmon?Isitelasticorinelastic?• Canyoucalculatethechangeinthegrocer’srevenueifheincreasesthepriceofsmokedsalmon?(TotalRevenue=PricexQuantity)
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Price Elasticity of Demand•
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Price Elasticity of Demand•
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Price Elasticity of Demand•
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Price Elasticity of DemandNowwhatifthesamegrocerystoreownerisdecidingtoincreasethepriceofbreadby10%from$3.00to$3.30,thequantityofbreadhecansellfallsfrom100unitsto98units.• Whatisthepriceelasticityofdemandforbread?Isitelasticorinelastic?• Canyoucalculatethechangeinthegrocer’srevenueifheincreasesthepriceofbread?(TotalRevenue=PricexQuantity)
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Price Elasticity of Demand•
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Price Elasticity of Demand•
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Price Elasticity of Demand•
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Price Elasticity of SupplyNowsupposethatthisgrocerobservesthathisneighborhoodischanging,andmanynewpeoplearemovingin.Thenumberofbuyersisincreasing.• Asaresult,thepriceofhisgoods,onaverageincreasesfrom$5to$7andthequantityofgrocerygoodssuppliedincreasesfrom1000to1250.• Whatisthepriceelasticityofsupply?
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Price Elasticity of SupplyNowsupposethatthisgrocerobservesthathisneighborhoodischanging,andmanynewpeoplearemovingin.Thenumberofbuyersisincreasing.• Asaresult,thepriceofhisgoods,onaverageincreasesfrom$5to$7andthequantityofgrocerygoodssuppliedincreasesfrom1000to1250.
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PrinciplesofMicroeconomicsModule2.2(C)
PriceElasticityofDemandandSupply
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IncomeElasticityofDemandByhowmuchdoesQdrespondtoachangeinincome?
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Income ElasticityConsider the popular brand of craft beer: Magic Hat and suppose the average income of a 23 year-old is $45,000. The 23 year-old consumes on average 5 Magic Hats a month. • When his income rises to $50,000, he consumes
9 Magic Hats per month. • What is his income elasticity of demand?• Is this a normal good or an inferior good?
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Income ElasticityConsiderthepopularbrandofcraftbeer:MagicHatandsupposetheaverageincomeofa23year-oldis$45,000.The23year-oldconsumesonaverage5MagicHatsamonth.• Whenhisincomerisesto$50,000,heconsumes9MagicHatspermonth.
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Cross Price Elasticity of DemandByhowmuchdoesQdrespondtoachangeinthepriceofarelatedgood?
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CrossPriceElasticityConsider,onceagain,themarketforbeer.• Whenthepriceofpretzelsmovesfrom$4to$3,theconsumptionofbeerincreasesfrom100unitsto120units.
1. Whatisthecrosspriceelasticityofdemandforbeerwhenthepriceofpretzelsrises?
2. Howarethesemarketsrelated?
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Cross Price ElasticityConsider,onceagain,themarketforbeer.• Whenthepriceofpretzelsmovesfrom$4to$3,theconsumptionofbeer
increasesfrom100unitsto120units.
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Key Takeaways• Understandingelasticityallowsustoquantifythechangesindemandandsupply.
• Providesanadditionalanalysistounderstandhowresponsiveness quantitydemandedandquantitysuppliedaretopricechanges,incomechangesandchangesinpricesofrelatedgoods.
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PrinciplesofMicroeconomicsModule2.3
ConsumerSurplusandProducerSurplus
100
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WelfareEconomics• Howtheallocationofresourcesandmarketoutcomesaffecteconomicwell-being
• Reachingequilibrium:maximizeswelfare(inmostcases)
• WelfareEconomics:ConsumerSurplus,ProducerSurplusandTotalSurplus
101
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ConsumerSurplus
Willingnesstopay– priceactuallypaid
• Everybuyerhasamaximumpricetheyarewillingtopayforeverygood
• Atlowerprices,hisconsumersurplusislarger– heis“betteroff”becausenotpayinghisfullmaximumprice
102
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ConsumerSurplus
Willingnesstopay– priceactuallypaid
• Everybuyerhasamaximumpricetheyarewillingtopayforeverygood
• Atlowerprices,hisconsumersurplusislarger– heis“betteroff”becausenotpayinghisfullmaximumprice
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ConsumerSurplus
• Ifthepriceofwaterisactually$2.50perbottle,wouldyoubuythewater?
• Ifyourmaxpriceis$5thenyes!Yourconsumersurplus is$2.50
• Ifyourmaxpriceis$2thenno
• Whathappensifthepricefallsto$70perday?
• Ifyourmaxpriceis$100:Yourconsumersurplusrisesto$30
• Ifyous maxpriceis$85– nowyoubuytheticketsandhavepositiveconsumersurplusof$15
Considerwhatyouwouldpayforabottleofwateratasummerconcert
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$2.50CS
P
Q
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ConsumerSurplus
• Ifthepriceofwaterisactually$2.50perbottle,wouldyoubuythewater?
• Ifyourmaxpriceis$5thenyes!Yourconsumersurplus is$2.50
• Ifyourmaxpriceis$2thenno
• Whathappensifthepricefallsto$1.50perday?
• Ifyourmaxpriceis$5:Yourconsumersurplusrisesto$3.50
• Ifyourmaxpriceis$2– nowyoubuythewaterandhavepositiveconsumersurplusof$1
Considerwhatyouwouldpayforabottleofwateratasummerconcert
105
NEWCS$1.50
$2.50CS
P
Q
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ProducerSurplusPriceactuallyreceived– willingnesstosell
• Everysellerfacesaminimumvaluetheyarewillingtoaccepttoselltheirgoods
• Thisreflectsthecostofproduction
• Athigherprices,hisproducersurplusislarger– heis“betteroff”fromsellinghisgoodsabovecost
106
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ProducerSurplusPriceactuallyreceived– willingnesstosell
• Everysellerfacesaminimumvaluetheyarewillingtoaccepttoselltheirgoods
• Thisreflectsthecostofproduction
• Athigherprices,hisproducersurplusislarger– heis“betteroff”fromsellinghisgoodsabovecost
107
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ProducerSurplusConsiderindependentfoodandbeveragevendorsatthesummermusicfestival,eachwiththefollowingwillingnesstosellabottleofwater:
Willingness tosell
VendorA $3.00
VendorB $2.75
VendorC $2.00
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ProducerSurplus• Ifthepriceofabottleofwateris$2.25,howmanyvendorswillsellwater?
• OnlyvendorC• P.S.willbe$0.25
• Whathappensifthepricerisesto$3.50perbottle?
• Allvendorswillsellwater• PSVendorA:$0.50• PSVendorB:$0.75• PSVendorC:$1.50
109
$2.25
P
Q
PS
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ProducerSurplus• Ifthepriceofabottleofwateris$2.25,howmanyvendorswillsellwater?
• OnlyvendorC• P.S.willbe$0.25
• Whathappensifthepricerisesto$3.50perbottle?
• Allvendorswillsellwater• PSVendorA:$0.50• PSVendorB:$0.75• PSVendorC:$1.50
110
$2.25
P
Q
PS
$3.50
NewPS
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TotalEconomicSurplus• Combinesconsumersurplusandproducersurplus
TotalSurplus=ValuetoBuyers– CosttoSellers
111
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TotalSurplusandFreeMarketOutcomes
• GOODSWILLBEALLOCATEDTO:• Buyerswhovaluethemmosthighly,asmeasuredbytheirwillingnesstopay.
• Sellers whocanproducethematthelowestcost.
Thefreemarketyieldsanequilibriumquantityandpricethatmaximizesbothconsumerandproducersurplus
112
$2.75
P
Q
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CS
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TotalSurplusandFreeMarketOutcomes
• GOODSWILLBEALLOCATEDTO:• Buyerswhovaluethemmosthighly,asmeasuredbytheirwillingnesstopay.
• Sellers whocanproducethematthelowestcost.
Thefreemarketyieldsanequilibriumquantityandpricethatmaximizesbothconsumerandproducersurplus
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$2.75
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KeyTakeaways
• WelfareEconomicsistheanalysisoftheeconomicwell-beingofproducersandconsumers
• Assumethatmarketoutcomesleadtomaximizedtotalsurplus
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PrinciplesofMicroeconomicsModule2.4
Taxation
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TaxesintheSupplyandDemandModel
Taxescause:Pricepaidbybuyer>PricereceivedbysellerInsert“wedge”intheSupplyandDemandmodel
Taxwedgecreatesdeadweightloss:Lossoftotalsurplusoreconomicwell-beingasaresultofthepolicy
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SalesTaxes• Taxesinsertawedgebetweenthepricepaidbybuyers(Pb)andpricereceivedbysellers(Ps)
• Regardlessofwhopaysthetax(sellersorbuyers)bothsharethetaxburden
• Tax=Pb – Ps• Taxrevenue=Tax*Qt• Taxburden(buyer)=Pb – Pe• Taxburden(seller)=Pe - Ps
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SalesTaxes• Taxesinsertawedgebetweenthepricepaidbybuyers(Pb)andpricereceivedbysellers(Ps)
• Regardlessofwhopaysthetax(sellersorbuyers)bothsharethetaxburden
• Tax=Pb – Ps• Taxrevenue=Tax*Qt• Taxburden(buyer)=Pb – Pe• Taxburden(seller)=Pe - Ps
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SalesTaxes• Taxesinsertawedgebetweenthepricepaidbybuyers(Pb)andpricereceivedbysellers(Ps)
• Regardlessofwhopaysthetax(sellersorbuyers)bothsharethetaxburden
• Tax=Pb – Ps• Taxrevenue=Tax*Qt• Taxburden(buyer)=Pb – Pe• Taxburden(seller)=Pe - Ps
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UnderstandingTaxesConsiderthemarketforsocks,wheretheequilibriumpriceofsocksis$5perpairandtheequilibriumquantityis300.Thegovernmentimposesa$1taxonthemarkettobepaidbytheseller,causingafallinthequantitysoldto200.
• Whathappenswhenthetaxisimposed?Drawoutthesupplyanddemandmodelshowingthemarketbeforethetaxandafterthetax
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UnderstandingTaxes
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Pe =$5
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UnderstandingTaxes
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Pe =$5
Qe =300
Pb =$5.50
Pb =$4.50
Qt =200
Tax:Pb – Ps$1
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UnderstandingTaxes
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Pe =$5
Qe =300
Pb =$5.50
Pb =$4.50
Qt =200
Tax:Pb – Ps$1
TaxRevenue=Tax*Qt$1*200=$200
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HowdotaxesaffectMarketParticipants?
Analyzethefollowingbeforetaxvs.aftertaxisimposed:• ConsumerSurplus• ProducerSurplus• TotalSurplus• GovernmentRevenue
Howdoesthetaxchangeeconomicwelfare?124
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ConsumerSurplus
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BEFORETAXES AFTERTAXES
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ProducerSurplus
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GovernmentTaxRevenue
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BEFORETAXES AFTERTAXES
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DeadweightLoss
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BEFORETAXES AFTERTAXES
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ElasticityandtheTaxBurden
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KeyTakeaways• Wecanthinkoftaxationinthecontextofsupplyanddemandmodelintermsof
• Howitaffectspricesandquantities• Howitaffectseconomicwell-beingviawelfareeconomics
• Sincetaxescausedistortionsinthemarket(taxwedge)theyyieldinefficientmarketoutcomes
• Whydowehavethem?Derivesomebenefitsfromgovernmentrevenue.
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