The Competition and Consumer Amendment (Misuse of Market Power) Act 2017 is an amending Act. Its main effect was to repeal and replace section 46 of the Competition and Consumer Act 2010. The replacement section sets out the misuse of market power rule covered by this page.
The core prohibition is directed at a corporation that has a substantial degree of power in a market. That corporation must not engage in conduct that has the purpose, or has or is likely to have the effect, of substantially lessening competition. The prohibition can apply in the market where the corporation has substantial power, but it is not confined to that market. It can also apply in other markets where the corporation, or a related body corporate, supplies goods or services or acquires goods or services, including where that supply or acquisition happens indirectly through one or more other persons.
In practical terms, the Act broadened the section 46 test. Businesses with strong market positions need to assess not only what they were trying to achieve, but also whether their conduct has, or is likely to have, a substantial anti-competitive effect in a relevant market.