No it doesn't and the complexity of the calculation would be too hard for me to explain at this time in the evening even if I did know it (which I don't). As I'm sure you're aware, willingness to sell a ticket in Y has very little connection with seats actually available in WT to sell. It's a constantly moving picture, with 3 other cabins all exerting an influence, and a ticking clock. The further someone is from the flight, the more likely that returning inventory will increase this inventory. Close up then there could be zero impact. Why is that? Because the system knew you were going to cancel your ticket before you did and has therefore taken it into consideration. If the flight is close in your action may simply result in fares in WTP not rising quite so fast as otherwise.

Otherwise, off to the Amazon to stop a few butterflies.