In which Amazon changes price in response to changes in demand

Instapundit:

OKAY, SO I WROTE ABOUT these Sony noise-cancelling headphones a couple of weeks ago, but now I see that they’re vastly cheaper in white. Go figure.

UPDATE: Okay, it’s $39.95, which is 20 bucks less than I paid, and 25 bucks less than they’re asking for the ones I bought now. And the only difference is color.

ANOTHER UPDATE: Geez, that was fast. They’ve already raised the price — in less than half an hour. This is like some kind of Heisenberg-pricing, where if I point it out, it changes . . . .

Posted at 8:27 pm by Glenn Reynolds