When did Mikhail Gorbachev declare Marxism was a failure?

Question by Brad: When did Gorbachev declare Marxism was a failure?
It’s in my notes from school. I need quotes please. Books, quotes, anything, which implies Gorbachev declared Marxism was a failure. The actual statement would be good.

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Answer by Alfonzoo
It depends what school your knowledge you pick.
Carl Marx is a failure in close combat, because he wore beard, that is a grab in such circumstance.
Otherwise not Gorbachev but Marxist economy gives the valid answer

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