It is kind of common knowledge in behavioral economics that there is such a thing as the "immediacy effect", i.e. subjects value rewards significantly higher, when they are obtained immediately.

But unfortunately there does not seem to be a paper, which studies this effect (apart from those concentrating on time preferences, which - if present biased - of course also produce a similar effect).

Do you know of experiments where this effect is analysed?

Thanks very much.

Michael