The term often leads into confusion, however, since international compact cars are somewhat larger than their North American equivalents, mostly because no supermini/subcompact size is manufactured by American, Mexican and Canadian car makers up to date.
By the late 1860's, Darwin came to describe this process as the survival of the fittest. This is very different from Lamarck's incorrect idea that the environment altered the shape of individuals and that these acquired changes were then inherited.
In the 1800s, after Darwin first published his book On the Origin of Species, a British economist Herbert Spencer used the term survival of the fittest in relation to Darwin's idea of natural selection as he compared Darwin's theory to an economic principle in one of his books.