A competitor who enforces its pre-existing contractual rights does not engage in unlawful competition merely because its conduct may create discomfort or confusion for parties who have entered into subsequent exclusive agreements with a rival. To succeed in a claim for unlawful competition based on interference with contractual relationships, a plaintiff must establish all requisites of Aquilian liability, including proof that the defendant committed a wrongful act. The enforcement of legitimate pre-existing contractual rights, even if those contracts are not exclusive, does not constitute wrongful interference with subsequent contracts. To obtain an interdict restraining unlawful competition through inducement to breach contracts, there must be evidence that the defendant intentionally and without justification induced or procured another to breach a contract, or evidence creating a reasonable apprehension that such conduct will occur in future. The mere fact that contractual relationships overlap or conflict does not render enforcement of pre-existing rights unlawful.