1. How does supply and demand (S&D) affect prices?
The most important thing to keep in mind with the theory of supply and demand is that the general models cannot be applied to the real world with any certainty. There are too many variables. But in order to understand the basic guide lines I will have a look at the theoretic models.
There is a model called equilibrium analysis (1), where we can build a model based on one commodity and see how that market operates. Model formed like this can then be applied to other markets to see how they behave.
The market for a particular good is said to be in equilibrium, when the demand for the good equals the supply of the good. The equilibrium price for this good is the price per unit of the good that allows the market to “clear”; in other words, the price for which the quantity demanded of good exactly equals the quantity supplied of the good. (2)
The market for a particular good is said to be in equilibrium, when the demand for the good equals the supply of the good. The equilibrium price for this good is the price per unit of the good that allows the market to “clear”; in other words, the price for which the quantity demanded of good exactly equals the quantity supplied of the good. (2)
By using equilibrium analysis it is possible to isolate one factor and see how the other factors are affected. There are two approaches to do this. One can either use algebraic approach or graphic approach. In Cliff Notes webpage algebraic approach is explained like this: "The algebraic approach to equilibrium analysis is to solve, simultaneously, the algebraic equations for demand and supply." (2)
In graphic analysis you depict S &D as curves, and you can determine the equilibrium price from the intersection. See the picture below.
Picture from https://www.cliffsnotes.com/study-guides/economics/demand-supply-and-elasticity/equilibrium-analysis
How to deal with these changes then? Well Wetherly's and Otter's The business environment gives following guide lines for using Equilibrium analysis:
- Assume the market's in equilibrium
- Introduce change (determine if S side or D side)
- S side-> supply curve will shift and move along the D curve
- D side-> demand curve will shift-> move along the S curve
- What will happen to price?
- Compare new equilibrium. Will this affect other markets?
The case of Levi's:
In 1980 people were switching to other sorts of trousers in stead of jeans. Levi's first had a failed attempt at diversifying their products, but then ended up trying to reinforce their existing brand. In 1985 they made a commercial in UK, with Nick Kamen stripping down. The sales were estimated to have risen 800% with this advert, as the demand rose.
2. What kind of different markets exist in perspective of S&D?
First I will define price elasticity for demand, as this is quite important factor in different types of markets. This is how it's defined in invetopedia:
"If a small change in price is accompanied by a large change in quantity demanded, the product is said to be elastic (or responsive to price changes). Conversely, a product is inelastic if a large change in price is accompanied by a small amount of change in quantity demanded."
http://www.freeeconhelp.com/2011/06/market-structures-perfect-competition.html
Different types of markets can be categorized based on the number of companies on the market, and this in turn greatly affects the competition (supply side factor). Let's have a look at the different market types.
1. Perfect competition
- market has many buyers and sellers
- no barriers entering or exiting the market
- all products are similar
- no transaction costs
- demand curve is perfectly elastic
picture from Boundless.com
In reality a market cannot stay perfectly competitive endlessly. If there are positive economic profits, new competitors will enter the market, supply curve will shift to the right, and equilibrium price will go down and so the economic profit will go down.
Equilibrium point for this market will occur when the demand curve (price) intersects the marginal cost (MC) curve and the minimum point of the average cost (AC) curve. (3)
2. Monopolistic competition
- differentiated products
- no major barriers to enter or exit
- companies are price setters and profit maximisers
- usually large number of independent companies on market
- highly elastic demand
- Majority of today's small firms exist in monopolistic competition
- in short run supernormal profits possible
- companies try to stay in the short sun with innovation and product differentiation
Picture: Economicsonline.co.uk
3. Oligopoly
- consist of few select companies that dominate the market
- even though they are competitors, these few companies tend to cooperate to some level
- this can lead to higher prices
- note: cartels
- examples of these industries are mobile phone operating systems, car industry and airlines
- heavy advertising
- barriers to enter market
- government regulations
- Oligopoly can have following affect on prices
- Price wars
- level prices
- collusion for higher prices
- companies can strive to either increase profit or market share (5)
4. Monopoly
- Definition of a monopoly is that a single company has over 25% market share
- Following things can lead to a monopoly:
- government regulation (for example VRin Finland)
- a company has a patent over a design
- a company has the ownership of scarce resource
- Government regulation can prevent a monopoly from being born (two big companies cannot merge if the result company would end up with over 25% market share)
- For example Kesko needed to get an approval from Finnish competition and consumer authority to buy Suomen lähikauppa (7)
3. What other factors than S&D affect prices?
-Cost of production
-Government regulations (tariffs, taxes, government owned monopolies)
-Purchasing power of customers (examples Norway-Indonesia)
-Objective
-Marketing method used (costs added to the price; brand, middlemen, couriers, after sale service etc.)
-Competition
References:
1. Wetherly, P. and Otter, D. 2008 The business environment
2. Cliff Notes: https://www.cliffsnotes.com/study-guides/economics/demand-supply-and-elasticity/equilibrium-analysis
3. Boundless.com https://www.boundless.com/economics/textbooks/boundless-economics- textbook/competitive-markets-10/perfect-competition-66/conditions-of-perfect-competition-248-12345/
4. Economics online http://www.economicsonline.co.uk/Business_economics/Monopolistic_competition.html
5. Investopedia http://www.investopedia.com/ask/answers/121514/what-are-some-current-examples-oligopolies.asp
7.Kesko stock exchange release 18.11.2015 http://www.kesko.fi/en/media/news-and-releases/stock-exchange-releases/2015/kesko-to-invest-in-finland-by-acquiring-suomen-lahikauppa--siwa-and-valintatalo-stores-return-to-finnish-ownership/

