An information database in communication with an information application comprises a plurality of marketplaces and a plurality of {HEAD ~ listings} respectively classified within {TAIL ~ the plurality} of marketplaces 
classified within
An information database in communication with an information application comprises a plurality of marketplaces and a plurality of { HEAD ~ listings } respectively classified within { TAIL ~ the plurality } of marketplaces
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH