Input (Factor of Production) Markets

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Presentation transcript:

Input (Factor of Production) Markets

Introduction Factor Markets Factors of Production: Land, Labour, Capital, Entrepreneurship Focus on Labour Review (to some extent)

Derived Demand The demand for a factor (say, labour) is a derived demand for the product that the factor produces.

Individual Supply of Labour (Review) Recall the income and substitution effects of a wage increase (I.e. labour-leisure trade-off) Substitution Effect: w   Price of Leisure   Demand for leisure   Supply of Labour  Income Effect: w   Real Income   Demand for leisure  () if leisure normal (inferior)  Supply of Labour  ()

Market Supply of Labour (Review) Wage Rate Labour Supply Curve Labour (hours)

Labour Demand (Review)

Labour Demand (Review) Maximise output subject to fixed amount of costs Capital a Labour

Labour Demand (Review) Maximise output subject to fixed amount of costs Capital a to c is the overall effect of a change (fall) in the wage rate c a Labour

Labour Demand (Review) Maximise output subject to fixed amount of costs Capital The substitution effect is a to b (b to c is the output effect) c a b Labour

Labour Demand (Review) Minimise costs subject to output constraint wL + rK = C Y = f(K,L)

Labour Demand (Review) The substitution effect is a to b Capital Min costs s.t. f(K,L) = output (fixed level) dl/dw < 0 & dk/dw > 0 a b Labour

Labour Demand Min costs s.t. F(K,L) = output (fixed level) Capital Conditional Factor Demand a b Labour

Labour Demand: Agenda Profit maximising labour demand curves – what determines the basic shape? Restrictions: Product and factor markets are assumed to be perfectly competitive.

Labour Demand: Agenda Short Run (capital fixed) Firm’s demand curve for labour? Market demand curve for labour? Long Run (capital variable)

Short Run: Firm’s Demand for Labour Capital is fixed, Labour is variable. As labour is increased the extra output resulting from the additional unit of labour declines, i.e. MPL declines. The additional revenue from employing an extra unti of labour is referred to as the Value of the Marginal Product (VMPL) = P.MPL.

Short Run: Firm’s Demand for Labour MPL Diminishing Marginal Returns MPL L

Short Run: Firm’s Demand for Labour MPL Diminishing Marginal Returns MPL L € VMPL = P.MPL VMPL L

Short Run: Firm’s Demand for Labour MPL Diminishing Marginal Returns MPL L € VMPL = P.MPL VMPL Perfect competition in product market assumed, i.e. firm cannot change P. L

Short Run: Firm’s Demand for Labour € W = VMPL = P.MPL W VMPL = DL Demand for labour by the firm L The wage is the marginal cost of an extra unit of labour and VMPL is the marginal benefit of an extra unit of labour.

Short Run: Market Demand for Labour As wage  Ld  for each firm Output  Price (P)  VMPL shifts inwards Market demand for labour curve is less elastic than the firm demand for labour curve Draw this yourself

Long Run: Firm’s Demand for Labour As wage  L and usually K  If K  then MPL  L again (i.e. an extra “kick”) The long run demand for labour curve is more elastic than the short run demand for labour curve Draw this yourself

Long Run: Market Demand for Labour As wage  Ld  for each firm Output  Price (P)  VMPL shifts inwards Long run market demand for labour curve is less elastic than the short run market demand for labour curve Draw this yourself