Many Americans are selling their used cars and buying new fuel-efficient hybrids. Other things remaining the same, in the market for used cars, and in the market for hybrids

Supply increases and price falls; Demand increases and price increases.

Explanation:

Other things remains the same,

If many Americans are selling their used cars, then this will lead to increase the supply of used cars in the market for used cars and shifts the supply curve rightwards. This shift in the supply curve will decrease the prices of used cars.

Now, Americans are buying new fuel-efficient hybrids which will increase the demand of hybrids in the market for hybrids and shifts the demand curve of hybrids rightwards. Therefore, this shift in the demand curve of hybrids will increase the prices of hybrids.

Note: Missing options are attached with the answer.

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