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 Imagem retirada de "The Countries With The Most Craft Breweries"

"there are two separate types of firms operating: generalists and specialists.
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Generalists are able to attract resources or consumers from the wide range of competitive dimension whereas specialists attract only a limited range. Although competing firms operate in the same market, there can be significant differences between consumers within this market. Consider the example of the market for beer: beer drinkers are distributed amongst age and social status, with a majority of consumers being of a middle social status and are middle aged. Generalists can (and do) target this mass market. Specialists may however target a particular part of the market, for example providing products that are attractive to older or younger consumers or provide specific products that appeal to lower or higher status consumers. These differences matter, in that ‘niches’ emerge where there exists an opportunity for a specialist to enter the market and gain market share from the incumbent firms.
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In early competition, generalists enter the market and tend to compete at the center of the market, without necessarily competing head-to-head.
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In further competition, the market may not be able to support two generalists, and one may be selected, forming a niche where the customers of the second firm are no longer served. This periphery of the market becomes unserved and exposed meaning that specialists are able to enter the market in these locations. These niches are often ‘legitimated’ by the entry of more specialists, and movement barriers may persist based on the difficulty for consumers to return to a generalist product.
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Finally, these niches take away customers from the incumbents, meaning that the generalist firm has fewer customers. Since the distribution of customers moves towards the niche supplier, these niche locations become ‘legitimated’.
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Therefore, as concentration of the industry increases it may mean superficially that it is an unattractive industry, and that the generalist firm is not satisfying the needs of peripheral customers. Rather than considering this as an unattractive industry, this can be an ideal breeding ground for specialist firms willing to offer a product closer to the needs of these peripheral customers."

Mongo decorre desta evolução natural.
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Trechos retirados de "The Dynamics of Strategy - Mastering Strategic Landscapes of the Firm" de Duncan Robertson e Adrián Caldart.