The brewing industry in the United States began in 1625 when the first brewery in America was founded. Lager beer as we know it today has changed a lot since then, and so has the industry. In the early nineteenth century the industry was highly fragmented, and competition among different breweries only existed in small geographic circles. It was not until the late nineteenth century that refrigeration and mechanical pasteurization revolutionized the industry. Companies could now transport beer across previous geographical limits.
After prohibition was repealed in 1933, the industry as it is today began to take shape. There was a sharp decline in the number of brewing companies, almost 90% from 1947 to 1995 as illustrated in Table 1. This was mostly due to four major breweries growing rapidly and realizing economies of
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