Given the task definition and input, reply with output. In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

What gave Hayek the idea to write his book?, Context: Hayek was concerned about the general view in Britain's academia that fascism was a capitalist reaction to socialism and The Road to Serfdom arose from those concerns. It was written between 1940 and 1943. The title was inspired by the French classical liberal thinker Alexis de Tocqueville's writings on the "road to servitude." It was first published in Britain by Routledge in March 1944 and was quite popular, leading Hayek to call it "that unobtainable book," also due in part to wartime paper rationing. When it was published in the United States by the University of Chicago in September of that year, it achieved greater popularity than in Britain. At the arrangement of editor Max Eastman, the American magazine Reader's Digest also published an abridged version in April 1945, enabling The Road to Serfdom to reach a far wider audience than academics. The book is widely popular among those advocating individualism and classical liberalism.
view in Britain's academia that fascism was a capitalist reaction to socialism