The Classical Theory of Economic Growth.

Within six years of publication, half the citations that there will ever be to a modern economics article will already have appeared.1 After that, with a few notable exceptions, references rapidly cease. That puts the achievement of Quesnay, Smith, Malthus, Ricardo and Marx into perspective, for after one or two hundred years their economics is still very much alive, and a good deal of it is still as controversial as when it first appeared.