reason for assymetricity of upload vs download speeds

I've noticed that my upload speeds over DSL are always lower than download
speeds. Is there a tchnological reason for this assymetricity? Or is this
artificial throttling of bandwidth imposed by the ISP's as a effective way
to introduce price-discrimination based pricing stratgies that make the
guys who value uploads pay more.(a minority of their target customers)

Is the net bandwidth of a medium constant; in the sense that can throttling
uploads cause a commensurate increase in download performance for other
users? If ethernet is one-person-talks-at-a-time medium maybe this might
hold? But wht about DSL or dialups? Just curious...Perhaps this is not the
best list for this question (sorry!) but I couldn't find another more
suitable. Besides, this list has one of the most knowledgable set of people
I know!

--
Rahul
.

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