Micro Demand and Supply Question?

What would the effects be on the mail delivery by the Post Office after the development of the internet using demand and supply reasoning?Which direct

What would the effects be on the mail delivery by the Post Office after the development of the internet using demand and supply reasoning?
Which directions of change of price and quantity was predictable regardless of how much you shifted each curve and which depended on how much each shifted?

or:What would the effects be on the mail delivery by the Post Office after the development of the internet using demand and supply reasoning?Which directions of change of price and quantity was predictable regardless of how much you shifted each curve and which depended on how much each shifted?

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