Earlier chapters have shown that competition can be defined in a number of ways. It follows that it is not possible to make a definitive economic statement as to whether a particular practice is ‘pro’ or ‘anti’ competitive. However, this theoretical difficulty has not prevented nation states legislating against ‘anti-competitive practices’, as Chapter 5 explains. The purpose of this chapter, therefore, is to seek to provide some insight into practices which have been deemed to have, or likely to have, ‘the effect of restricting, distorting or preventing competition in connection with the production, supply or acquisition of goods or services’ (Competition Act, 1980, s.2).