Bit presumptuous to assume I have not been involved with the creation of markets, trading, etc. I have seen stuff work as well as fail up close in large arenas. [Edit: sorry, I should not snark. You are right that criticizing is easy creation is not.]

Going from academic ideas of markets and experiments to actual deep and useful markets is surprisingly difficult.

EDIT: the failure to create proper working markets for GDP-linked derivatives is good example of something that should but actually ain't. Not enough market making risk takers, limited hedges, unbalanced demand between long and short demand, index issues, ...