What Happens to the Value of Favors Over Time?

From Noah Goldstein: Yes! Taken from https://www.psychologytoday.com/blog/yes/200809/what-happens-the-value-favors-over-time

According to Stanford University researcher Frank Flynn, the answer to this question depends on whether you are the favor-doer or favor-receiver. Flynn suggests that immediately after one person performs a favor for another, the recipient of the favor places more value on the favor than does the favor-doer. However, as time passes, the value of the favor decreases in the recipient’s eyes, whereas for the favor-doer, it actually increases. Although there are several potential reasons for this discrepancy, one likely possibility is that, as time goes by, the memory of the favor-doing event gets distorted; and since people have the desire to see themselves in the best possible light, receivers may think they didn’t need all that much help at the time, while givers may think they really went out of their way for the recipient.