Text: In those cases, where there is enough quantity available to satisfy most bidders, the going price will be set by the sensible middle of the pack rather than by the most overoptimistic extremist.
Entailment: In the cases, where there is enough quantity available to satisfy most bidders, the going price will not be set by the most overoptimistic extremist, but by the sensible middle of the pack.
Contradiction: In all cases, there is enough quantity available to satisfy most bidders.