Criticism on the concept of exchange efficiency (with reference to pareto methodology)?

what is the actual concept of exchange efficiency ?
criticism on the concept of exchange efficiency ?
can exchange efficiency condition be satisfied with out market mechanism imder the following conditions ?
a) if indifference curve turns gto be L-shape
b) if indifference curve turns to be straight line or negatively sloped
c) if indifference curve of individual A is horizontal and individual B is vertial
d) if indifference curve of two individuals are horizontal
e) if indifference curve of two individuals are vertical

please do explain me the above headache problems

Answer:
b means there's no reducing marginal utility
c the first is perfectly elastic (like a lugurious car), the second is perfectly inelastic (like food)

d)The both are willing to buy the good only if they can buy it for that price no more, the seller in willing to sell the good for that price, no less

e) The two are will to buy the good regardless of the price (like food or water)
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