Posted by **Brittany** on Tuesday, October 12, 2010 at 5:00pm.

Why do supply curves slope upward from left to right?

Why don't we sometimes draw them sloping downward from left to right?

Under what conditions would it be sensible to draw a supply curve that is horizontal(perfectly elastic)?

Under what conditions would it be sensible to draw a supply curve that is vertical(perfectly inelastic)?

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