The lophophore /ËlÉfÉfÉÉr/ is a characteristic feeding organ possessed by four major groups of animals: the Brachiopoda, Bryozoa, Hyolitha, and Phoronida, which collectively constitute the protostome group Lophophorata. All lophophores are found in aquatic organisms.
market metrics. Definition. Quantitative measurements of a specific securities market. Typically used by analysts to track a company's performance. For example, pre-tax earnings is a metric used to determine how efficiently a company earns revenue prior to paying corporate taxes.
Market structures can be characterized by sellers or buyers or both. Most economics texts classify markets by seller. Generally, they identify 4 basic types of markets; (1) pure (or perfect) competition, (2) monopolistic (or imperfect) competition, (3) oligopolistic competition, and (4) monopoly.