Economists have long understood that competition between firms brings the advantages of lower prices, improved quality and greater consumer choice. This is because firms deliver on these or they will be competed out of the market.
The Australian Competition and Consumer Commission (ACCC) chairman has warned that market concentration (the percentage of market share held by the biggest firms) has risen to a level where consumers are possibly going to be worse off.
If a firm has monopoly power then they typically charge more and sell less, but earn higher profits. Over the last few decades mergers and takeovers have led to a very high proportion of Australian output being concentrated in the top 100 firms.
This provides a problem for the ACCC who regulate competition. The article below suggests that a change of rules whereby the firms that merge or want to takeover another have to prove the result will not harm competition. At present the ACCC have to prove it would harm competition.
An interesting point made by the ACCC is that if we want the benefits of economies of scale to work through to lower prices then we have to maintain a competitive environment. In other words a merger/takeover may improve productive efficiency but harm allocative efficiency.
This article deals directly with competition policy in Australia so is directly relevant to VCE economics. This is a part of IB economics also, and the harm that monopolies do to efficiency is often visited on Paper 1 of Higher Level in questions on the theory of the firm.
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