This is an example of framing, see George Lakoff https://en.wikipedia.org/wiki/George_Lakoff#Writings who insists on the importance of framing highlighting that ideas that are outside the frame can be dismissed, challengers are forced to engage in the debate using the assumptions of those creating the frame. The strength of “there is no alternative” is precisely this.
In so far as it allows the losers to be kept under control it overlaps with the role of the Zeitgeist and Hegemony referred to in What is Power and Where does it come from?, particularly the section on Ideas and Beliefs including the note referencing Gramsci, Galbraith and Our Natural Selves
The so called Overton Window is also relevant here; https://en.wikipedia.org/wiki/Overton_window
Part 3 Consider - On Power - Ways of Exerting Power