population densities?

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Senior Member

"Rural population densities are of prime importance in modifying the implications of the different relations of production under which land is used." (from Idoceonline)

Why here does it use the "population densities are" not "population density is", as in my mind, here "population density" is an indicator, so it is enough to use the singular.

Thank you for your reply.
  • The Newt

    Senior Member
    English - US
    The idea is probably that there are different densities in various areas within the overall region to which the remark is meant to apply.
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