The Reason
With MLB on the cusp of trading season and trade season rumors, Pirates Prospects thought it might be a good time to re-evaluate the Trade Surplus Values that we use in our Trade Target articles.  The original values were developed by Victor Wang back in 2008 as explained in this Hardball Times article and shown in this Beyond the Box Score post.  Wang used the Baseball America Top 100 Prospects lists from 1990-1999 to track how each prospect performed in his first 6 years of team-controlled time.

Now was the time to update the data for a variety of reasons.  First, the article is 4 years old so it is always a good idea to refresh the concept.  The second reason is that I feel "prospecting" has been refined greatly over the past few years.  Hitting and pitching environments ...

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