Which of the following statements best describes the concept of consumer surplus?
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"I was all ready to pay $300 for a new leather jacket that I had seen in Macy's but I ended up paying only $180 for the same jacket."
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"Safeway was having a sale on Dreyer's ice cream so I bought 3 quarts."
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"I paid $130 for a printer last week. This week the same store is selling the same printer for $110."
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"I sold my Blu-ray copy of Ben-Hur for $18 at a garage sale even though I was willing to sell it for $10."