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Consider the following table showing quantity demanded for a commodity at different prices

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Consider the following table showing quantity demanded for a commodity at different prices.

If price falls from $400 to $350: (a.) arrows representing the price and quantity effects both point up; (b.) an arrow representing the price effect points up and is shorter than an arrow for the quantity effect; (c.) total revenue moves in the same direction as the arrow representing the price effect; (d.) the arrow representing the price effect points down and the arrow representing the quantity effect points up; both (c.) and (d.).