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Why are download speeds higher than upload speeds?

Asked by rebbel (35550points) March 13th, 2013

Whenever I see ads from mobile phone carriers, or from Internet providers, I notice that download speeds are usually much higher than the upload speeds.
Why is that?
I mean, it all goes through the same cable/ether, right?
Someone around here that explain this to me?
In a way that you would explain it to your grandma, please.

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