Section 45 of the Competition and Consumer Act prohibits contracts, arrangements, understandings or concerted practices that have the purpose, effect or likely effect of substantially lessening competition in a market, even if that conduct does not meet the stricter definitions of other anti-competitive conduct such as cartels.
From 1 January 2012 if you choose to provide a warranty against defects to consumers then the warranty document you provide must comply with specific Australian Consumer Law (ACL) requirements.
Broadly speaking, exclusive dealing occurs when one person trading with another imposes some restrictions on the other’s freedom to choose with whom, in what, or where they deal. Exclusive dealing is against the law only when it substantially lessens competition.