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Samenvatting Algemene Economie

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ALGEMENE ECONOMIE
INHOUDSOPGAVE

H1: WAT IS ECONOMIE? OBJECT, DOEL EN METHODE ........................................................................... 7

PRAKTISCH...........................................................................................................................................7
FUNDAMENTEEL ECONOMISCH PROBLEEM: VEELVULDIGE BEHOEFTEN VERSUS SCHAARSE MIDDELEN.....................................8
Economische wetenschap ................................................................................................................8
Behoeften vs schaarse middelen .......................................................................................................8
Micro vs macro economie ................................................................................................................9
Opportuniteitskost ..........................................................................................................................9
CENTRALE PLANNING VERSUS HET MARKTMECHANISME ..................................................................................... 10
Economische systemen .................................................................................................................. 10
METHODOLOGISCHE ASPECTEN VAN ECONOMISCHE ANALYSE ............................................................................... 12

H2: HET MARKTMECHANISME .........................................................................................................13

INLEIDING.......................................................................................................................................... 13
De markt ..................................................................................................................................... 13
Voorwaarden marktwerking .......................................................................................................... 13
MARKTVRAAG..................................................................................................................................... 13
Vraagfunctie ............................................................................................................................... 14
Partiele vraagfunctie..................................................................................................................... 14
Vraagcurve .................................................................................................................................. 15
Lineaire vraagcurve ...................................................................................................................... 15
Beweging langs de vraagcurve ....................................................................................................... 16
Verschuiving langs de vraagcurve ................................................................................................... 16
HET MARKTAANBOD.............................................................................................................................. 16
Aanbodfunctie ............................................................................................................................. 17
Partiele aanbodfunctie .................................................................................................................. 17
Aanbodcurve .............................................................................................................................. 17
Lineaire aanbodcurve .................................................................................................................... 18
Beweging Vs verschuivingen .......................................................................................................... 18
HET MARKTEVENWICHT .......................................................................................................................... 18
Verandering van het marktevenwicht .............................................................................................. 20
DE PRIJSELASTICITEIT VAN VRAAG ............................................................................................................... 21
Verband met totale uitgaven ........................................................................................................ 24
Determinanten ........................................................................................................................... 25
Empirische schattingen ............................................................................................................... 26
PRIJSELASTICITEITEN VAN AANBOD ............................................................................................................. 26
Determinanten ........................................................................................................................... 28
ANDERE PRIJSELASTICITEITEN ................................................................................................................ 28
Kruiselingse prijselasticiteit ......................................................................................................... 28
Inkomenselasticiteit.................................................................................................................... 29


1

, DE MARKT EN OVERHEIDSINTERVENTIES........................................................................................................ 29
Indirecte belastingen .................................................................................................................. 30
Subsidies ................................................................................................................................... 32
Minimum- en Maximumprijzen (Directe beinvloeding) ................................................................... 34
Directe beinvloeding door beinvloeding veranderde hoeveelheid ................................................... 35
Productiequota ........................................................................................................................... 36
Invoerbeperkingen ...................................................................................................................... 36
BESLUIT ........................................................................................................................................... 37

H3: CONSUMENTENGEDRAG EN DE AFLEIDING VAN DE VRAAG .............................................................37

INLEIDING.......................................................................................................................................... 37
NUT, MARGINAAL NUT EN CONSUMPTIEBESLISSINGEN ....................................................................................... 38
Totaal vs marginaal nut................................................................................................................. 38
Marginaal nut: wetten .................................................................................................................. 38
Kardinaal vs ordinaal nut ............................................................................................................... 40
Theorie van het consumentengedrag .............................................................................................. 40
PREFERENTIES, INDIFFERENTIECURVEN EN NUTSFUNCTIES ............................................................................ 41
Indefferentiecurve....................................................................................................................... 41
Nutsfunctie ................................................................................................................................ 43
Nutsfunctie en indefferentiecurve ................................................................................................ 44
Verdieping: indefferentiecurven ................................................................................................... 45
DE BUDGETBEPERKING ........................................................................................................................ 46
DE OPTIMALE KEUZE VAN DE CONSUMENT ..................................................................................................... 48
Numeriek voorbeeld...................................................................................................................... 49
VERANDERINGEN VAN HET CONSUMENTENEVENWICHT................................................................................. 50
Veranderingen in de voorkeuren ................................................................................................... 50
Veranderingen in het inkomen ....................................................................................................... 51
Verandering in de prijs ................................................................................................................. 52
Het substitutie- en inkomenseffect !!examen ................................................................................ 53
CONSUMENTENGEDRAG IN ACTIE: TOEPASSINGEN ............................................................................................ 56
Benzine of diesel? ......................................................................................................................... 56
AFLEIDING VAN DE MARKTVRAAG UIT DE INDIVIDUELE VRAAGCURVEN ................................................................ 57

H4: PRODUCTIE EN KOSTEN VAN BEDRIJVEN OP KORTE EN LANGE TERMIJN ...........................................58

INLEIDING.......................................................................................................................................... 58
BEDRIJVEN EN DE ORGANISATIE VAN DE PRODUCTIE .......................................................................................... 58
Waarom bestaat een bedrijf? ......................................................................................................... 58
Doelstellingen en beperkingen........................................................................................................ 59
Efficientie .................................................................................................................................... 59
PRODUCTIE EN KOSTEN: ENKELE INLEIDENDE BEGRIPPEN ..................................................................................... 59
De productiefunctie ...................................................................................................................... 59
Cobb-Douglas productiefunctie ................................................................................................... 60
Relevante kosten .......................................................................................................................... 62
Irrelevante kosten......................................................................................................................... 63
Kosten ........................................................................................................................................ 64
HET GEDRAG VAN DE PRODUCENT OP LANGE TERMIJN: DE OPTIMALE KEUZE VAN INPUTS IN DE PRODUCTIE ........................... 64
Isoquanten .................................................................................................................................. 65
A) Marginale technische substitutiegraad ................................................................................. 66

2

, B) Schaalopbrengsten ............................................................................................................. 68
Keuzeprobleem van de producent ................................................................................................... 70
Numeriek voorbeeld...................................................................................................................... 72
Speciale gevallen .......................................................................................................................... 73
Output en totale kosten................................................................................................................. 74
Toepassing: loonverhoging ............................................................................................................ 74
PRODUCTIE EN KOSTEN OP KORTE TERMIJN .................................................................................................... 75
Korte- en langetermijnproductiefunctie ........................................................................................... 75
Wet van de variabele meeropbrengsten........................................................................................ 76
Marginaal en gemiddeld product .................................................................................................... 76
Kosten op korte termijn ................................................................................................................. 78
SAMENHANG TUSSEN DE KORTE- EN DE LANGETERMIJNKOSTEN ............................................................................. 82

H5: PRIJSVORMING ONDER VERSCHILLENDE MARKTSTRUCTUREN .........................................................84

INLEIDING.......................................................................................................................................... 84
Verschillende marktstructuren........................................................................................................ 85
WINSTMAXIMALISEREND GEDRAG ............................................................................................................ 86
ZUIVERE MEDEDINGING .......................................................................................................................... 86
Winstmaximalisatie op korte termijn ............................................................................................... 87
CRITERIA VOOR HET ONDERSCHEIDEN VAN VERSCHILLENDE MARKTVORMEN .............................................................. 88
Numeriek voorbeeld...................................................................................................................... 89
Individuele aanbodsfunctie ............................................................................................................ 89
Numeriek voorbeeld...................................................................................................................... 90
Marktaanbod............................................................................................................................... 91
Langetermijnevenwicht ................................................................................................................. 92
Overgang van kort naar lange termijn ........................................................................................... 92
MONOPOLIE....................................................................................................................................... 94
Opbrengsten ................................................................................................................................ 95
Evenwicht .................................................................................................................................... 97
Lerner-index ................................................................................................................................ 98
Prijsinzetting ................................................................................................................................ 98
OLIGOPOLIE ....................................................................................................................................... 99
Strategisch gedrag en speltheorie ................................................................................................... 99
Collusie en kartel ........................................................................................................................ 100
Bertrand model van prijsconcurrentie ............................................................................................ 101
MONOPOLISTISCHE CONCURRENTIE .......................................................................................................... 102
Voorbeeld.................................................................................................................................. 103

H6: MARKTIMPERFECTIES EN DE ROL VAN DE OVERHEID ................................................................... 104

INLEIDING........................................................................................................................................ 104
WELVAARTSIMPLICATIES VAN DE WERKING VAN DE VRIJE MARKT ......................................................................... 105
Consumentensurplus ................................................................................................................... 105
Producentensurplus .................................................................................................................... 106
Efficiëntie van de vrije markt ........................................................................................................ 106
Marktwerking en pareto-efficiëntie ............................................................................................... 107
Pareto efficientie allocatie ........................................................................................................... 107
OORZAKEN VAN MARKTFALING EN DE ROL VAN DE OVERHEID ............................................................................. 108
Monopolie ................................................................................................................................. 108

3

, Zuivere en quasi-publieke goederen .............................................................................................. 113
Externe effecten ......................................................................................................................... 116
Imperfecte informatie ................................................................................................................. 118

H7: PRODUCTIE, INKOMENS EN BESTEDINGEN ................................................................................. 121

INLEIDING........................................................................................................................................ 121
PRODUCTIE, TOEGEVOEGDE WAARDE EN FACTORVERGOEDINGEN ........................................................................ 121
Finale goederen ......................................................................................................................... 122
VOORRADEN .................................................................................................................................... 123
SOORTEN FACTORVERGOEDINGEN ............................................................................................................ 124
BRUTO- VERSUS NETTOPRODUCT ............................................................................................................. 124
FUNDAMENTELE GELIJKHEID TUSSEN PRODUCT, INKOMEN EN BESTEDINGEN ............................................................ 125
MACRO-ECONOMISCHE IDENTITEITEN VOOR EEN GESLOTEN ECONOMIE ZONDER OVERHEID ........................................... 125
EENVOUDIGE ECONOMISCHE KRINGLOOP .................................................................................................... 126
BRUTO BINNENLANDS PRODUCT, NATIONAAL INKOMEN, NATIONALE BESTEDINGEN EN BESTEDING VAN HET BINNENLANDS PRODUCT
................................................................................................................................................... 127
Gesloten economie met overheid .................................................................................................. 128
Open economie met overheid ....................................................................................................... 130
FINANCIERINGSTEKORTEN EN -OVERSCHOTTEN.............................................................................................. 131
WAARDERINGSPROBLEMEN ................................................................................................................... 132
Alternatieve welvaartsindicatoren ................................................................................................ 132
UITSCHAKELING VAN DE PRIJSINVLOED ....................................................................................................... 133
DE IMPLICIETE PRIJSINDEX VAN HET BBP...................................................................................................... 134
Index van het nominale en het reële bbp ........................................................................................ 134
Groeivoet van het nominale en het reële bbp ................................................................................. 135
Inflatie aan de hand van de bbp-deflator ....................................................................................... 135
BESLUIT .......................................................................................................................................... 136

LES 8: MACRO-ECONOMISCH EVENWICHT IN DE KORTE EN IN DE LANGE TERMIJN ................................. 136

INLEIDING........................................................................................................................................ 136
DE AGGREGATIEVE VRAAG ..................................................................................................................... 137
Verschuiving van de AV curve ....................................................................................................... 138
HET AGGREGATIEVE AANBOD IN DE LANGE TERMIJN ........................................................................................ 140
Verschuiving van de AA(lt)-curve .................................................................................................. 140
Procentuele verandering in Y* ...................................................................................................... 141
HET AGGREGATIEVE AANBOD IN DE KORTE TERMIJN ........................................................................................ 141
Verschuiving van de AA(kt)-curve .................................................................................................. 142
VAN KORTE NAAR LANGE TERMIJN ............................................................................................................ 142
MACRO-ECONOMISCH EVENWICHT: VRAAG- EN AANBODSCHOKKEN ..................................................................... 144
Evenwicht op lange termijn .......................................................................................................... 144
Effect negatieve vraagschok ........................................................................................................ 144
Effect van een positieve vraagschok .............................................................................................. 145
De outputkloof ........................................................................................................................... 145
Negatieve aanbodschok ............................................................................................................ 146
BESLUIT .......................................................................................................................................... 147

LES 9: A) CONSUMPTIE, INVESTERINGEN EN DE AGGREGATEVE VRAAG ................................................ 147

INLEIDING........................................................................................................................................ 147

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