Demography of the Good Player, Part I: Amateur Origins
Recently, Jeff Sullivan wrote a piece here attempting to answer a question notable both for its simplicity and importance. The question: how many good players were good prospects?
As Sullivan notes, one typically finds the question pursued in reverse: of this or that group of prospects (top-10 prospects, top-100 prospects, etc), how did they fare in the major leagues (if they even made it that far)? There’s great utility in this sort of information — in particular where our understanding of prospect valuations is concerned. An appearance by a young player on one of these prospect lists tends to indicate, if not certain future value, at least present trade value. In other words: even those prospects who fail to record even one plate appearance or innings — even they are capable of possessing significant value.