When a consumer buys something in large number, he or she usually has to pay less or gets discount. As such the consumer pays less than the original selling price of the comodity if he buys in bulk. In other words the price per unit of the comodity decreases. The seller also makes a profit when he sells some items in bulk numbers as the seller sells in large quantities.
The maximum number of turning points in a cubic function is 2.
In this case,
The discriminant is , which means the derivative has no real roots. This means there are no critical points and thus no turning points/relative extrema.
, which means the derivative has no real roots. This means there are no critical points and thus no turning points/relative extrema.