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Suppose a certain good provides an external benefit. If the private cost of the last unit of the good that was produced is equal to the social value of that unit, then the sum of producer and consumer surplus is maximized.
Allopatric
Referring to populations of a species that are geographically separated, leading to genetic divergence and potentially speciation.
Allopatric Speciation
A mode of speciation occurring when biological populations of the same species become isolated from each other to an extent that prevents or interferes with genetic interchange.
Parapatric Speciation
A mode of speciation in which new species evolve in adjacent or overlapping geographic areas, often due to differences in habitat or environmental pressures.
Sympatric Speciation
The process by which new species evolve from a single ancestral species while inhabiting the same geographic region.
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