Published On:Thursday, 8 December 2011
Posted by Muhammad Atif Saeed
Price Mechanism
The invisible hand – the workings of the price mechanism
The price mechanism plays three important functions in any market-based economic system: The signalling function
Firstly, prices perform a signalling function. This means that market prices will adjust to demonstrate where resources are required, and where they are not. Prices rise and fall to reflect scarcities and surpluses. So, for example, if market prices are rising because of high and rising demand from consumers, this is a signal to suppliers to expand their production to meet the higher demand. Consider the left hand diagram on the next page. The demand for computer games increases and as a result, producers stand to earn higher revenues and profits from selling more games at a higher price per unit. So an outward shift of demand ought to lead to an expansion along the market supply curve.  In the second example on the right, an increase in market supply causes a fall in the relative prices of digital cameras and prompts an expansion along the market demand curve Conversely, a rise in the costs of production will induce suppliers to decrease supply, while consumers will react to the resulting higher price by reducing demand for the good or services. The transmission of preferences Through the signalling function, consumers are able through their expression of preferences to send important information to producers about the changing nature of our needs and wants. When demand is strong, higher market prices act as an incentive to raise output (production) because the supplier stands to make a higher profit. When demand is weak, then the market supply contracts. We are assuming here that producers do actually respond to these price signals! One of the features of a free market economy is that decision-making in the market is decentralised in other words, the market responds to the individual decisions of millions of consumers and producers, i.e. there is no single body responsible for deciding what is to be produced and in what quantities. This is a remarkable feature of an organic market system. The rationing function Prices serve to ration scarce resources when demand in a market outstrips supply. When there is a shortage of a product, the price is bid up – leaving only those with sufficient willingness and ability to pay with the effective demand necessary to purchase the product. Be it the demand for tickets among England supporters for the 2006 World Cup or the demand for a rare antique, the market price acts a rationing device to equate demand with supply. The prices for using the M6 Toll Road are a good example of the rationing function of the price mechanism. A toll road can exclude those drivers and vehicles that are not willing or able to pay the current toll charge. In this sense, motorists and road haulage businesses and other road users are paying for the right to use the road, road space has a market price instead of being regarded as something of a free good. The current charges are below:
The growing popularity of auctions as a means of allocating resources is worth considering as a means of allocating resources and clearing a market. The phenomenal success of EBAY is testimony to the power of the auction process as a rationing and market clearing mechanism as internet usage has grown. The price mechanism is the only allocative mechanism solving the economic problem in a free market economy. However, most modern economies are mixed economies, comprising not only a market sector, but also a non-market sector, where the government (or state) uses the planning mechanism to provide public goods and services such as police, roads and merit goods such as education, libraries and health. In a state run command economy, the price mechanism plays little or no active role in the allocation of resources. Instead government planning directs resources to where the state thinks there is greatest need. The reality is that state planning has more or less failed as a means of deciding what to produce, how much to produce, how to produce and for whom. Following the collapse of communism in the late 1980s and early 1990s, the market-based economy is now the dominant economic system – even though we are increasingly aware of imperfections in the operation of the market – i.e. the causes and consequences of market failure. Prices and incentives
Often the incentives that consumers and producers have can be changed by government intervention in markets. For example a change in relative prices brought about by the introduction of government subsidies and taxation. Suppose for example that the government decides to introduce a new tax on aviation fuel in a bid to reduce some of the negative externalities created by the air transport industry.
 Agents may not always respond to incentives in the manner in which textbook economics suggests. The “law of unintended consequences” encapsulates the idea that government policy interventions can often be misguided of have unintended consequences! See the revision focus article on government failure. | |||||||||||||||||||||||||||||||||||
| Author: Geoff Riley, Eton College, September 2006 | |||||||||||||||||||||||||||||||||||
