The binding legal principles established by the majority are: (1) A collective agreement that purports to regulate the operations of pension funds beyond matters of mutual interest between employers and employees, and that usurps the statutory regulatory functions of the Financial Sector Conduct Authority under the Pension Funds Act, is ultra vires and unlawful; (2) Pension fund rules are binding on all stakeholders, including participating employers and their representative organisations, and cannot be indirectly overridden through collective agreements that make rule amendments a prerequisite for continued participation in an employment sector; (3) The independence of pension fund trustees, statutorily protected under section 7C of the PFA, cannot be lawfully fettered through collective agreements that effectively coerce trustees to adopt rules not in the best interests of the fund or its members; (4) Where a collective agreement has far-reaching consequences extending to non-parties (including pensioners and non-unionised employees) and effectively exercises public power by determining which entities may operate in a sector, it is subject to review under the principle of legality and must satisfy the rationality test; (5) The principle of legality requires that collective agreements with public power dimensions must be rationally connected to a legitimate purpose, must take account of relevant considerations, and must not be arbitrary or capricious; (6) Section 71 of the Municipal Systems Act requires that organised local government, when concluding collective agreements, must act within its mandate and must consider the budgets, fiscal capacity and efficiency of municipalities, particularly where agreements may result in substantial financial liabilities.