At present companies tend to concentrate because groups, including industrial and financial groups and transnational corporations, are currently a fundamental element of the world economy. The business of entities is not conducted solely through independent entities. There is a growing trend of establishment of groups of entities united among them by capital structure, and whose business is under the control of or is influenced by on of them. The latter entity is required to prepare and furnish, in addition to its own accounts, consolidated accounts of the entities of the group that it controls or influences.