Back in Capitalism, the Eccentric Large Rich Man is planning to make money from the Yeti somehow. I guess he'll pay people to look at the Yeti; he's probably not going to pay the Yeti, for which Karl Marx would like a word with him.
Karl Marx is not there though, so the Fourth Doctor objects on his behalf, by yelling at him in a video conference that the Yeti has rights and shouldn't be a publicity slave.