Finance Set of points reflecting risk return combinations achieved by particular portfolios.

Finance Market in which prices reflect all available information so that excess risk-adjusted returns are not possible.

Finance One of a set of portfolios that provides the highest level of return for a given level of risk.

Test used to determine whether a firm's conduct is in breach of competition law provisions, based on the premise that such conduct is unlawful if it is likely to exclude a rival that is at least as efficient as the dominant firm.

Test used to determine whether a firm's conduct is in breach of competition law provisions, based on the premise that such conduct is unlawful if it is likely to exclude a rival that is at least as efficient as the dominant firm.