Social Darwinism is a Hard Problem.

(Above image;swallow's nest canon IXY digital 900IS)
Social Darwinism is a ideology, sense of value,and tough world view.
On the other hand,the appearance of this theory looked as if positive,scientific by pretending biology.
In fact, social evolutionism had appeared earlier than Darwinism. Harbert Spencer made up social Darwinism as if positive studies.
A Social Darwinism is very difficult to be proved it's false point. Because this theory often use selfjustifying tautology. Economist Hayek didn't applying Darwinism to economics. Because he thought Natural selection is obviously different from cultural evolution.
He thought the merit of free market system does not always depend on competitiveness too. Market system is based on complex tacit customs , and moreover it is based on far different scale from biological evolution. His studies itself was based on social evolutionism. But his evolutionism is almost same as empiricism or pragmatism. Man can only get wisdom from trial and error.His evolutionism is a method not answers .After all we absolutely will not recognize what is evolution.Because we cannot predict how unexpected twist will happen. He believed free market system can only enable people to get free(not always competitive) activity in open society.

Socialism is a social darwinism.

(left image; Ikki Kita　Social philosopher １８８３－１９３７）
Japanese often misunderstand social Darwinism. That is to say,market economy is under the law of the jungle,or Meritocracy is natural selection. As if free economy system were social Darwinism.
Before WWⅡ, There was a famous National Socialist "Ikki Kita(北一輝）. He would imagine free competitive marriage system. He thought this would make social evolution. He was ultra right. He was known as one who was seriously influenced by Darwin in Japan.
Generally speaking, the socialists are influenced by Darwin on concern with not economy but family problem.
Of course, Darwinism itself is ,Whether his theory is right or not, biological science, not family system studies.