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Style Boxes map financial products on a two axes diagram, but instead of using continuous values for the axes, they use discrete values (small/medium/large, value/blend/growth, etc.).

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How is this useful? Why should $1 be able to shift a product between squares? What's wrong with using for example the actual (normalized?) market cap on one axis and the actual (normalized?) P/E ratio on the other axis, in the familiar Cartesian representation?

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    To the vote to closer - the question is clear as day. The boxes have 9 choices. And the answer shows the new system is continuous. – JTP - Apologise to Monica Sep 10 '17 at 17:18
  • The answer is "because it's a marketing tool". – BrenBarn Sep 12 '17 at 5:54
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It appears that in 2016 Morningstar presented a new framework for style box based analysis, which is continuous:

enter image description here (source)

Another document from 2004 shows a similar continuous nature:

enter image description here (source)

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