I understand the why [nice rundown].  What I don&#x27;t understand so much is why people do this in practice for some kids of goods but not others.  It&#x27;s not as if local shoemakers are having a new golden age [Oak Street, excepted], or knifemakers or garment makers (tailors, seamstresses).<p>A shoemaker moreover would have more involvement [manufacture] than a mere &quot;merchant&quot; which is what booksellers are.