Queensland Wire Industries Pty Ltd v The Broken Hill Proprietary Company Limited

Queensland Wire Industries Pty Ltd (QWI) appealed to the High Court of Australia against a decision of the Federal Court of Australia, which had affirmed a judgment of the Supreme Court of Queensland. The dispute concerned allegations by QWI that The Broken Hill Proprietary Company Limited (BHP) and its subsidiary, Australian Wire Industries Pty Ltd (AWI), had engaged in conduct that contravened section 46 of the Trade Practices Act 1974 (Cth). Specifically, QWI alleged that BHP, by refusing to supply Y-bar to QWI and instead using it for its own downstream production of wire products, had taken advantage of its substantial market power in the steel market to the detriment of QWI.

The central legal issue before the High Court was whether BHP's conduct constituted a misuse of its market power in contravention of section 46 of the Trade Practices Act. This involved determining the relevant market or markets for the purposes of assessing BHP's market power and whether BHP had taken advantage of that power in a way that substantially lessened competition or prevented QWI from engaging in competitive conduct. The Trade Practices Commission sought leave to intervene, arguing that the case presented an important opportunity to clarify the interpretation of section 46, particularly concerning "market definition by reference to supply-side substitution."

The High Court, in its reasoning, focused on the interpretation of section 46. It was held that the section did not require proof of anti-competitive intent or purpose. Instead, the focus was on whether the corporation had a substantial degree of market power and whether it had taken advantage of that power. The Court considered the definition of the relevant market, noting that it was not necessarily confined to the immediate product but could extend to related products and the potential for supply-side substitution. The Court ultimately found that BHP had a substantial degree of market power in the market for steel and steel products, and that its decision to consume all its Y-bar production internally, thereby denying it to a competitor like QWI, constituted taking advantage of that power in a manner that contravened section 46.

The High Court allowed the appeal, finding that BHP had contravened section 46 of the Trade Practices Act. The matter was remitted to the Federal Court for the determination of appropriate remedies.