[p2p-hackers] Re: Memory and reputation calculation

[MULLER Guillaume]

Hi all,

Right, I would have cited Dellarocas' papers also because he is the only
one I know that worked on this subject.

However, IMHO, his claim that size of history doesn't matter is false.
He took this conclusion in very a specific domain that is eBay-like
market-places with very specific assumption (cf. cited paper).

My idea is that size of history DOES matter. Let's imagine a system
(even eBay-like) where every agent *knows* that the history is a list of
the X last encounters experiences. Then it is easy to see that cheating
1/X times  is a strategy that pays off (particularly in systems where
ratings might be noisy).

IMHO, the key point with respect to the history is that others should
not be able guess its size. If it has a fixed size, I believe it doesn't
matter if (and only if) other can guess its size (and therefore cannot
use strategy as described above).

However, I'm sorry I didn't have time to make any experimentations, but
I'd like to hear if anybody has.

Regards

G. MULLER

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