The Outcome of a Negotiated Agreement Is Deemed Efficient Only

The outcome of a negotiated agreement is deemed efficient only if:

A) neither the buyer nor the seller receives more than 60% of the total surplus.
B) the sum of the buyer's and seller's profit shares is less than 100%.
C) the agreement equitably balances both sides' interests.
D) both parties benefit from the agreement (relative to their walk-away options) .
E) no other agreement makes one party better off without making the other worse off.