If Susan receives $3,000 of value from a computer that she was able to purchase from Joe's Computer Shop for $1,800, this indicates that

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Susan received $3,000 worth of value from the computer, but only had to pay $1,800 for it. This means Susan enjoyed a consumer surplus of $1,200 ($3,000 - $1,800), which is the benefit she received from purchasing the computer. Option A is incorrect because opportunity cost is the value of the next best alternative given up, and we do not have any information on what Susan's other options were. Option B is also incorrect because we do not know the cost to Joe of acquiring the computer he sold to Susan. Option D is incorrect because we do not know the actual cost of the computer to Joe.

If Susan Receives $3,000 of Value from a Computer That