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countable and uncountable, plural perversities
The quality of being perverse. examples
Something which is perverse. quotations examples
More generally, for the ULD property to hold, the substitution effects (which are always well behaved) must be large enough to overcome possible “perversities” coming from the wealth effects.
1995, Andreu Mas-Colell, Michael D. Whinston, and Jerry R. Green, Microeconomic Theory, Oxford University Press, page 112