Creating a pipeline. Building up the farm. Filling the prospect cupboard.
Call it what you want, but it's all the rage these days. Developing homegrown talent is no longer seen as a necessity just for low-revenue teams; even the biggest-market organizations have re-dedicated themselves to building from within.
What each club does with its farm system varies. Some want to funnel players up to the big leagues to contribute (see Rays, Tampa). Others use the farm system as pawns in trades (see Diamondbacks, Arizona or Mets, New York). And some are trying to find a happy medium (see Red Sox, Boston and Yankees, New York).
There's no set criteria for evaluating systems. Any combination of overall depth, number of elite prospects and/or total players close to contributing can be used to come up with a list. As a result, everyone's top five will be different, though there are some teams most can agree on.
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