Still disagree here. The marginal value of a win come July 31st is worth far more than a potential win during the offseason for teams in the hunt (as it can be the difference between making the playoffs and/or winning a World Series) . Teams are emphasizing short-term production over efficient spending / surplus value.
Furthermore, the trade deadline is a fairy restricted market and prices reflect that. Teams that are desperate to fill holes come July typically pay a premium because sellers have the leverage. The classic surplus value calculation doesn’t change, but market factors dictate a less efficient trade will likely be required.
The value of a prospect should not change simply because a team is competitive as that prospect’s value is still based on what other teams would give up to acquire them. The trade deadline simply forces teams to pay a premium to acquire what they need at that point in time in an inefficient market.