Learning from people who piss you off

In a post a couple of weeks ago ("How not to negotiate"), I mentioned a potential vendor who had pissed me off. As I noted in a later comment on that post, in retrospect I had handled our interaction poorly. I knew the right negotiating tack (as I've used it successfully before) and took the wrong one instead. The right response when asked by a potential vendor what your budget is is to say, as I have on previous occasions,

I prefer not to specify a budget ahead of time, so as not to prejudice your estimate.

Instead, for some reason I took the bait and made a low ball offer. In a post yesterday on her Atlantic blog ("The Naive Negotiator"), Megan McCardle explained the problem with low ball offers:

There is a zone of possible agreement (known to those who study this sort of thing as the ZOPA). You can't negotiate your way out of that zone no matter where you start. Nor does starting from a more aggressive bargaining point always mean that you will do better in the negotiation. It can often mean you do worse, because you poison the process.

My mother used to sell real estate, and you'd see this a lot with stupid buyers, particularly men using newbie agents: they'd submit an unrealistically low bid on the notion that this would force the buyer to bargain down. What it actually did was convince the buyer that it was a waste of time to negotiate with you, and/or make them angry.