Here are entered works on technological, economic, or legal conditions of a market which raise the costs of firms wanting to enter the market above those of firms already in the market, or which otherwise make new entry difficult.
Here are entered works on combinations in restraint of trade in which independent business enterprises formally agree among themselves to control or limit output, prices, and/or markets so as to achieve monopolistic power. Works on combinations in which stock ownership is transferred to trustees, who in turn issue trust certificates and dividends and who attempt to achieve monopolistic control over output, prices, or markets, are entered under Trusts, Industrial.
Here are entered works on a company's sales of a particular product as a percentage of the total industry sales of that product over a given period of time.
Here are entered works on the control by a single industry or firm of successive stages in the process of production of a particular good. --subdivision Vertical integration under individual industries, e.g. Construction industry--Vertical integration