It does, but not as bad as letting your deal ride through the term posted. IIRC, it back dates to the day of posting with normal rate of rot, and then applies the accumulative rot at once. In other words, if unsold, you'll see the same amount of rot as if not on the market; though, I'm notnsurebif you save anything to roundings this way (not sure if it uses decimals at all for values).
IIRC to try and prevent people from putting food on the market just to prevent rot, the rot rate is much higher when the offer expires than if it just sat in your granaries.
