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I have been reading the paper of Goerner and Ulancowicz - "Quantifying economic sustainability" in which it is suggested that there is a tradeoff between sustainability and efficiency. ...

Complementary slackness condition in the KKT theorem states that: $\lambda_i^*\geq0; \lambda_i^*h_i(x^*)=0 $ The usual reasoning goes like this: either constraint is clack $h_i(x^*)>0$ and then ...