One difficult aspect of assessing the value of prospects is trying to figure out just how much is one worth. When I was reviewing the trades this past season or in years before, I have mainly relied on top 100 prospect lists and, sometimes, John Sickels B and C age based ratings for those who do not make the list. However, recently FanGraphs, Baseball Prospectus, MLB.com, 2080 Baseball, and others have begun using the 20-80 scale to designate prospect values.
Fangraphs performed an exercise to determine value based on rankings and some peculiar associations came up.