Between the recent MLB draft, trade deadline and players graduating to the majors, there has been so much movement since I wrote our preseason prospect lists that it's time to update my farm system rankings again.
For reference, the dollar values are based on a study by FanGraphs that took the expected big league output on average by each tier of prospect, converted that to dollars using teams' free agency spending history, and then subtracted the projected salary they would be paid in the big leagues to yield a surplus value, aka how much a team would pay to acquire the player's six-plus years of control before free agency.