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Mercantile Bank Corp operates as a bank holding company. It offers various commercial banking services to individuals, businesses, governmental units, and other institutions. These services include deposit products such as checking, savings, and term certificate accounts and lending products such as commercial, residential mortgage, and installment loans. The company generates revenue from interest and dividends earned on loans, securities, and other financial instruments.

Berkshire Hathaway is a holding company with a wide array of subsidiaries engaged in diverse activities. The firm's core business segment is insurance, run primarily through Geico, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. Berkshire has used the excess cash thrown off from its operations to acquire Burlington Northern Santa Fe (railroad), Berkshire Hathaway Energy (utilities and energy distributors), and the companies that make up its manufacturing, service, and retailing operations (which include Precision Castparts, Lubrizol, Clayton Homes, Marmon, and IMC/ISCAR). The conglomerate is unique in that it is run on a completely decentralized basis.