This report is to present the basic economy theory about demand-supply curve and relative factors effecting the curve. Patterns and key factors of perfect, monopoly and oligopoly market are separately discussed.

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Demand-Supply Curve – BMW Case

--- by Raymond

Summary

This report is to present the basic economy theory about demand-supply curve and relative factors effecting the curve. Patterns and key factors of perfect, monopoly and oligopoly market are separately discussed.

The UK automobile industry and UK economy are analyzed in detail. The BMW group’ analysis and data generates another part of the background information.  Under the oligopoly market of the UK automobile industry, BMW and main competitors’ position and trends are introduced. BMW’s market position, share, competitive advantage and company strategy and their influence / impact to the Demand Supply Curve is discussed, which is supported by using all the internal and external factors of the BMW car-manufacturing. Certain conditions are assumed for the BMW Demand Supply Curve in UK market in 1999.

Furthermore, the relationship between the demand and supply curves, key points and BMW exact supply and demand curve are compared and created to further practice the application of demand and supply curves.

The trends of the whole UK automobile market and the shift of BMW’s demand supply curve are analyzed. Alternatives on withdraw the UK market (Rover division) or keep developing on current market are given according the analysis. Various recommendations to maintain BMW market position in UK market and the feasibility among each items are stated at the end.

1. Basic economic theory:

  1. The Demand Curve:

A demand schedule is an estimate of demand for a good per time period (per day, per month etc.) at any given price level. A demand curve is a graph of a demand schedule, with price on the y axia and quantity demanded on the x axis. It is intuitively obvious that the higher the price charged for a product, the less will be sold, other things being equal. This is the basis for the economic concept of the demand curve.  

A typical demand curve is shown in Exhibition 1, slopes downwards from the left to the right. Together with the quantities which would be purchased at two prices P1 and P2. If the quantity changes by a large relative amount when price is changed, the demand curve is said to be "elastic", and if the quantity is not affected much by changes in price it is said to be "inelastic" (The elasticity concept can be expressed mathematically, but here we concentrate on the general meaning of the idea). In the Diagram the price fell by half from P1 to P2, while the quantity bought increased by about three times from Q1 to Q3. This demand curve is therefore elastic in the range Q1 to Q3.

                                       Exhibition 1

Factors influencing demand:

  • The price of the good;
  • The price and availability of substitute goods;
  • The price and availability of complements;
  • The size of household income;
  • Tastes, fashions, attitudes towards a good;
  • Consumer expectations about future market conditions;
  • The distribution of income among the population.

Different factors affect demand for a product in different ways; for example, some affect the market as a whole, while others affect only potential company sales.

DETERMINANTS OF MARKET SIZE

  • Product Life Cycle
  • Business Cycle
  • Exogenous shocks
  • GNP Elasticity
  • Exchange Rates

DETERMINANTS OF MARKET SHARE

  • Price
  • Marketing

  1. Supply Curve:

The supply curve for an industry, with price on the y axis and quantity supplied on the x axis, shows the amount which companies in total would be willing to sell at different prices, holding other factors constant. The position and shape of the supply curve depends on production costs; it is therefore to be expected that the supply curve will be upward sloping, i.e. the higher the price the greater the quantity companies would be willing to supply. A typical supply curve is as follows:

                                                                     

                                                                          Exhibition 2

At price P the total quantity supplied by the industry would be Q. If price were higher than P then more than Q would be supplied, and vice versa. The slope of the supply curve depends on the cost structure of the companies in the industry.

Factors influencing the quantity of a good that firms want to supply are:

  • The price of the good.
  • The marginal costs of producing the good.
  • The prices and the costs of making other goods that firms could switch to making instead;
  • Supply conditions.

There are many factors which affect the elasticity of the industry supply curve. The current level of capacity utilisation, the cost of increasing capacity, the availability and wage costs of additional employees, the availability of raw materials, the potential for foreign competitors to enter the market are all potentially important, and tend to change over time. For example, a sudden change in preferences towards pure wool garments would probably not result in price increases until the current stocks of wool were exhausted. After that point the supply curve would be inelastic because of the time lag involved in increasing the number of sheep and waiting for the next shearing season.

  1. Equilibrium price:

Prices are determined by the interaction of demand and supply. The production of goods and services depends on the costs which companies incur in supplying different quantities. The demand for goods and services depends on what people are willing to pay for different quantities. The interaction of demand and supply produces prices, which serve as signals to seller and buyers. An understanding of price determination makes it possible to make predictions about the outcome of changes in both demand and supply conditions.

                                                           Exhibition 3

  1. Cost and supply curve:

Average Costs (AC):

Average costs are quite simply, total costs/number of units of output produced.

Marginal Costs (MC):

Marginal cost is the cost of producing one extra unit of output.

                                                                Exhibition 4

A very significant feature of the relationship between these two is illustrated arithmetically as below:

When AC is at minimum, AC=MC

When AC is falling in value, AC>MC

When AC is rising in value, AC<MC

The AC curve is U-shaped, it can be affected by the law of diminishing returns in the short run and by the economies of scale in the long run.

In the short run, variable factors will be combined with fixed factors to produce the firm’s output; at low volumes of output, extra units of a variable factor might succeed in producing an increasing MPP; Eventually, the MPP will start to get smaller. Returns from the extra quantities of variable factor will therefore get smaller or ‘diminish’.

Long run output decisions are concerned with economies of scale when all factor inputs are variable. The MC will rise with output all the time, because of diminishing returns.

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  1. Revenues:

Revenues and profits. Profit maximisation:

Average revenue (AR) = Price

Marginal revenue (MR) is the extra revenue earned by selling one extra unit of output.

If price is constant, MR=AR

If price must be reduced to sell more, MR will be less that AR.

Exhibition 5

A company will continue to make extra profit by producing  and selling more if MR exceeds MC. MR will never rise as more units are sold, but may fall.

Profit can be measured as:

Profit per unit AR-AC

Total profit    (AR-AC) x Q

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