The most influential book in Western economics?

From Yang Jisheng: The man who discovered 36 million dead (Paul Mason's article on Yang Jisheng, author of Tombstone: The Untold Story of Mao's Great Famine):

He had stumbled on Friedrich von Hayek's The Road to Serfdom in a library and chuckles with mild scepticism when I tell him it is probably the most influential book in Western economics:

"Before I read Hayek, I had only read works the party wanted me to. Hayek says that to use the state to promote a utopia is very dangerous. In China that's exactly what they did. The utopia promoted by Marx, even though it is beautiful, it is very dangerous."

The most influential book in Western economics? Or what Kate Zernike saw as one of a number of once-obscure texts by dead writers?