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