The main reason a company looks to merge or acquire another company is to increase shareholder value. This can be done for a number of reasons, as follows:
- Synergy: This refers to the fact that the combined company can often reduce duplicate departments or operations, lowering the costs of the company relative to the same revenue stream, thus increasing profit.
- Increased revenue/Increased Market Share: This motive assumes that the company will be absorbing a major competitor and thus increase its power (by capturing increased market share) to set prices.
- Cross selling: For example, a bank buying a stock broker could then sell its banking products to the stock broker's customers, while the broker can sign up the bank's customers for brokerage accounts. Or, a manufacturer can acquire and sell complementary products.
- Economies of Scale: For example, managerial economies such as the increased opportunity of managerial specialization. Another example are purchasing economies due to increased order size and associated bulk-buying discounts.
- Taxes: A profitable company can buy a loss maker to use the target's loss as their advantage by reducing their tax liability. In the United States and many other countries, rules are in place to limit the ability of profitable companies to "shop" for loss making companies, limiting the tax motive of an acquiring company.
- Geographical or other diversification: This is designed to smooth the earnings results of a company, which over the long term smoothens the stock price of a company, giving conservative investors more confidence in investing in the company. However, this does not always deliver value to shareholders (see below).
- Resource transfer: resources are unevenly distributed across firms (Barney, 1991) and the interaction of target and acquiring firm resources can create value through either overcoming information asymmetry or by combining scarce resources.
- Vertical integration: Vertical Integration occurs when an upstream and downstream firm merge (or one acquires the other). There are several reasons for this to occur. One reason is to internalise an externality problem. A common example is of such an externality is double marginalization. Double marginalization occurs when both the upstream and downstream firms have monopoly power, each firm reduces output from the competitive level to the monopoly level, creating two deadweight losses. By merging the vertically integrated firm can collect one deadweight loss by setting the upstram firm's output to the competitive level. This increases profits and consumer surplus. A merger that creates a vertically integrated firm can be profitable.