The largest city within a nation which dominates the country not solely in size—being more than twice as large as the second city, as in London and Birmingham, UK—but also in terms of influence. The development of primacy is not fully understood but some researchers have suggested that the importance of the primate city tends to decline as the economy grows and that, therefore, primacy tends to occur in less developed nations. However, the rise of the primate city may be encouraged by colonialism, as it occurs often at the major port. Capital cities of past empires tend to be over-large. See rank-size rule.




