Before revision:  In the paper , we propose a new pricing theory with several rules to solve the paradoxand state that the fair pricing should be judged by the buyer and the seller independently. The seller is concerned about costs, and the buyer is concerned about the realistic prospect of returns.
After revision:  In the paper , we propose a new pricing theory with several rules to solve the paradoxand state that the fair pricing should be judged by the seller and the buyer independently. Reasonable pricing for the seller may not be appropriate for the buyer. The seller cares about costs, and the buyer is concerned about the realistic prospect of returns.