Real life drift will usually have very little representation in options, in a very indirect form only, such as change in borrow (an asset with an obvious downtrend is usually a popular short) and skew (since it is a popular short, again).
I wonder if the changing degrees in that skew that is in popular shorts says anything about the life of the trend....
Opened another position: Long 2 VXX Jan13 28 put @1.58 Short 3 VIX Jan13 16 put @1.10 Total credit 1.10*2 - 1.58*3 = 0.14 Same assumptions as in the last month: VIX stays above 16 while VXX keeps moving down.
As of this writing: VXX 28 put is .52 (loss (1.58-0.52)*2 =2 .12) VIX 16 put is .40 (gain (1.10-0.40)*3 = 2.10) Total: loss .02