It's even more amusing if you follow the insight--Darwinism is just the application of 18th/19th century Anglospheric economic theory to our view of the world, but pretends that the theory is natural rather than intelligent.

The natural laws of Physics were stolen from economic theory too. You heard it here first. . . .

Darwin read a lot of Malthus and said it was reading Malthus that gave him his inspiration about the mechanism working in natural selection. One quote:

"In October 1838, fifteen months after I had begun my systematic inquiry, I happened to read for amusement Malthus on Population, and being prepared to appreciate the struggle for existence which everywhere goes on, from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result would be the formation of a new species."

Hmmm, Googling around I find that and a lot more of Darwin on Mathus here.

My memory is that Darwin also mentioned Adam Smith somewhere or other, as would be natural in knowing Malthus so well, but I won't swear to it, and it was Malthus who had the big impact on him.