To advise Mr. PB on how to sell the 400 jars of peanut butter by Friday, we should consider the elasticity of demand and how price changes might affect sales.
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Reducing the price to $0.80 per jar - This option generally makes sense if demand is elastic; reducing the price can increase quantity demanded, helping Mr. PB reach his sales goal.
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Removing all advertisements - This would likely shift demand to the left, meaning fewer customers would be interested in purchasing peanut butter, which is counterproductive when trying to sell the remaining inventory.
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Continuing to sell at the current price - If demand is elastic, he might not be able to sell the 400 jars at $1.00 as consumers could be sensitive to price changes.
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Putting peanut butter on sale for $0.40 per jar - This steep reduction could lead to very high demand, potentially selling out quickly. However, it greatly reduces profit margins.
Given these options, reducing the price to $0.80 per jar at least until Friday seems like the most reasonable choice. It balances encouraging sales without heavily sacrificing the price.
So I would recommend: Reduce the price of peanut butter to $0.80 per jar at least until Friday.