They say hindsight is 20/20.
More often than not, that's more fact than cliche when it comes to the sport of baseball. Transactions, especially trades, are a gamble. One player can perform better in a certain market while the other could fall flat on his face.
One of the biggest grey areas in the sport is also one of the biggest debates: prospects. Do you trade unproven players for established, MLB-proven guys? Do you keep your top prospects and hope to develop a contender through your own system?
That debate will never end.
However, it would be nearly impossible to operate as a franchise without having to make those tough decisions, and that's true for the Philadelphia Phillies, especially over the last couple of seasons, but in the past as well.
There are going to be prospects, and even MLB players, that teams don't want to move but have to. There are going to be players that they do want to move and later regret. It's just part of the game.
Here are 25 players that the Phillies once traded but, in hindsight, never should have moved.