All revolutions are economical. The American one is about taxes, and the French is about well... taxes. But the answer to the question is what defines them from being political or social. The Americans and French revolutionaries of the 1700s thought the answer to this was more political freedom.

The Russian revolutionaries of the 1910s thought the answer was a social regime. The fact that it did not end up as they hoped it would be, does not change the fact that it was a social revolution. I considering the motivations here for the revolutions, not so much the outcome.