Abstract
Changes in consumer surplus have been approached in two different ways [1,2]: one is the compensating variation (CV), which is the amount of income that an individual is ready to pay to keep his utility as it was before a change; the other is the equivalent variation (EV), which is the amount of money the individual is ready to accept for the change. For welfare gains, CV and EV are known as willingness to pay (to attain the gain, WTP) and willingness to accept (to accept the absence of the gain, WTA) respectively; but for a welfare loss, CV and EV refer to WTA (to compensate the loss) and WTP (to prevent the loss).
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