determining a difference between a sum of the prices of the bid that lie on a search path connected to said subtree and {HEAD ~ the current price} of {TAIL ~ the best allocation} 
of
determining a difference between a sum of the prices of the bid that lie on a search path connected to said subtree and { HEAD ~ the current price } of { TAIL ~ the best allocation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL