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Why are standard languages often based on the dialect of a capital city?

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Thematic map of Europe displaying the distribution of Germanic languages, with different colors indicating regions where English, German, Netherlandic (Dutch), Frisian, Swedish, Danish, Norwegian, Icelandic, and Faroese are spoken. Striped areas mark regions where bilingualism is common, and language regions cover countries such as the United Kingdom, Germany, the Netherlands, Denmark, Sweden, Norway, Iceland, and parts of surrounding countries. — Dialect Distribution of the Germanic languages in Europe.

Standard languages often emerge from the dialect of a capital city because of the social prestige associated with the speech of a nation's most powerful, wealthy, and educated citizens. As these individuals occupy positions of influence in administration, literature, and economic life, their language naturally becomes a model for the rest of society.1

This process is driven by the desire to minimize linguistic variation, which is further stabilized through the creation of dictionaries, grammars, and the intervention of scholarly or governmental institutions. While the capital’s dialect—such as London in England or Paris in France—frequently serves as the base, a standard language may also derive from a major cultural or economic center, or even a combination of several regional dialects. Over time, these standards may evolve as they incorporate elements from other dialects, reflecting the historical development of the region.1