Firms with significant market power may expand their boundaries through vertical integration not for efficiency gains, but to strategically foreclose rivals. By acquiring a key supplier or distributor, a dominant firm can deny competitors access to essential inputs or markets, thereby raising rivals' costs, limiting competition, and solidifying its own market position.

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In markets with low competition, such as monopolies or oligopolies, the boundaries of a firm are less disciplined by market efficiency. Instead, factors like managerial discretion, the pursuit of market power, strategic foreclosure of competitors, or the desire for control over the supply chain can become the primary determinants of a firm's scope, even if these choices lead to higher costs than market-based alternatives.

Firm Boundary Determination in Non-Competitive Markets

In a capitalist system, the fundamental goal of profit maximization creates a strong incentive for firms to reduce the competitive pressures they face. As Adam Smith noted, businesses often prefer to limit competition rather than engage in it. This can manifest in various strategies, from lobbying for regulations that create barriers for new entrants to acquiring rival companies, all aimed at securing greater market power and profitability.

Firms' Incentive to Weaken Competition

In firms with a separation of ownership and control, and weak market discipline, managers may expand the firm's boundaries beyond the point of efficiency. This 'empire-building' is driven by managerial incentives such as increased compensation, prestige, or job security, which are often tied to the size of the firm rather than its profitability. This can lead to inefficient vertical integration or diversification at the expense of shareholder value.

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