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What may be inferred about items such as bread, water or medication?

Incorrect.

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While the demand for all three products is similarly inelastic, nothing in the passage indicates that the same level of demand exists for all three.

Great!

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Since the demand is inelastic, a seller could theoretically charge any price and still sell these products.

Incorrect.

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An inelastic product can cost any amount without affecting the demand for that product. This means that demand, not price, remains the same.

Incorrect.

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The passage suggests nothing about the prices of these items in the Middle Ages.

Incorrect.

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An inelastic product can cost any amount without affecting the demand for that product. This means that demand remains the same.

Demand for these items is unstable.
They were all sold for high prices during the Middle Ages.
A seller could demand any price for these essential items.
Their prices will always remain stable since they are essential for life.
There is a similar amount of demand for all three products.