?

Log in

No account? Create an account
Previous Entry Share Next Entry
You have been outbid...
chap
nmg

Bother. I spotted an emergency power off panel from an IBM 1602 on eBay over the weekend, and was out-sniped within the last ten seconds (I'd set my snipe for 29 seconds, figuring that there wasn't likely to be a great deal of interest in a 3kg block of metal). On the plus side, the postage would have cost me the best part of USD50.

For those of you that might be wondering why I'd want an obsolete IBM boat anchor, might I refer you to one of autopope's stories, particularly the last four paragraphs.



  • 1
First price sealed bids lead to over-bidding, which can be a problem (witness the 3G spectrum auciton - good for HMG, bad for everyone else).

Sorry, yes - it should go for the second bid.

The problem with the spectrum auction was that any phone company that didn't win some space on the spectrum was effectively dead in the water - which meant it was a case of pay or die. This doesn't work for much the same reason that selling critical medical care doesn't work - when you must have something its value is infinite...

Hmm

eBay isn't first price sealed bid (I guess you understood that, but subsequently you don't make the distinction clear). The underlying mechanism in eBay is actually more similar to Vickrey. You automatically pay just enough to beat the next best bid by the auction's minimum increment.

The actual issue with eBay is that the bidders aren't rational. No amount of modelling with rational agents will tell you anything about how eBay works. We could try to create a system which punished irrationality more thoroughly than eBay, but that doesn't achieve anything except a sense of righteousness for people who understand auction theory.

For example, the very message you quoted exists only because eBay's customers are irrational. eBay earns nothing by telling a rational actor that they've lost the auction, they could determine this for themselves and they have no further interest in the auction because their fair price has been exceeded by another bidder. But in reality the irrational people actually using the service routinely re-bid when they receive this message.

When everyone else is insane, you have to use apparently insane tactics to get what you want. Hence the sniping.

Yup, that's kinda how I feel.

Except that I throw my hands in the air, declare I can't be arsed, and bid what I'm willing to pay straight off. If someone else wants to outbid me then fine - I'll go elsewhere and buy it there.

  • 1