Why are the answers to the previous two questions different? a) Economics is just crazy like that.

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Question:

Why are the answers to the previous two questions different?
a) Economics is just crazy like that.
b) The professor taught us wrong.
c) The geometric method assumes infinite divisibility, resulting in an over approximation, which becomes proportionately smaller as you sum across all consumers in the market.
d) This is simply too deep of a mystery to fathom on a midterm.