What's the Correct Denomination for Coins?

Well, this is more understandable (and less alarmist). As you know, dominant ideas achieve dominance for a reason: they come to be seen as more plausible, convincing, efficacious, etc. than their competition. And "fringe" ideas remain on the fringe because they effectively lost the argument.

Until a fringe idea gains a critical mass of support—becomes compelling—it will remain overlooked.

Thus we have the inertia of paradigms; however, the onus is always on the challenger.

 

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Well, except that until Keynes came along and government liked the results of his ideas other systems were considered acceptable. It is very unlikely that Keynesianism would have taken over so much without governmental support.