Copyright 2006 – Biz/ed Theory of Firms Costs, Revenues and Objectives.

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Presentation transcript:

Copyright 2006 – Biz/ed Theory of Firms Costs, Revenues and Objectives

Copyright 2006 – Biz/ed Theory of Firms Profit: –Difference between Revenue and Cost Π = TR - TC

Copyright 2006 – Biz/ed Theory of Firms Revenue = amount received from the sale of goods or services TR = P x Q

Copyright 2006 – Biz/ed Theory of Firms Total Cost is the sum of all costs – fixed, variable and semi-fixed Fixed Costs – do NOT depend on quantity produced- Rent, Rates, Insurance, etc. Variable Costs –vary directly with the amount produced – raw materials Semi–Fixed Costs - may vary with output but not directly – some types of labour, energy costs

Copyright 2006 – Biz/ed Theory of Firms Factor Costs : Labour – wages/salaries Land – rent Capital – interest Enterprise - profit

Copyright 2006 – Biz/ed Theory of Firms Average Cost = Total cost divided by the number of units produced AC = TC/Q AVC = TVC/Q AFC = TFC/Q

Copyright 2006 – Biz/ed Theory of Firms Marginal Cost The cost of producing one extra or one less unit of output MC = TC n units – TC n-1 / Q If TC of 100 units = £500 and TC of producing 101 units is £505, MC = £5.00 Important concept

Copyright 2006 – Biz/ed Theory of Firms Short and Long run: Short run – some factors fixed and cannot be increased/reduced Long Run – time taken to vary all factors of production Short and long run vary in all industries:

Copyright 2006 – Biz/ed Theory of Firms Railways – short run –’easy’ to increase labour, long lead times for new rolling stock – 5 years? Supermarkets – short run – can buy new shelving, hire staff, etc but opening of new stores takes several years Local Builder – short run buys new tools, hires assistant; long run – purchasing a new van – a couple of months?

Copyright 2006 – Biz/ed Theory of Firms Diminishing Marginal Returns Assumptions – some factors fixed (e.g. capital and land) Adding variable factor – (labour) Total Product Average Product – TP / Q variable factor (Qv) Marginal Product ΔTP/ΔQv

Copyright 2006 – Biz/ed Theory of Firms Increasing the variable factor: TP rises at first, slows then falls AP rises at first then starts to fall MP rises, then falls, cuts AP at highest point of AP, cuts horizontal axis at point where TP starts to fall

Copyright 2006 – Biz/ed Theory of Firms Objectives of firms: Profit maximisation Profit satisficing Long term survival Share price maximisation Revenue maximisation Brand loyalty Expansion and market dominance