While investigators pore over tomes of paperwork to ferret out the possibly inside provenance of information about ImClone--which had already plunged the stock ten points when Martha finally sold--the rest of the world is left to contemplate the baffling challenge of finding any shred of actionable data about a company that cannot be deemed an inside tip.

FORBES: Magazine Article

Before long, catalogs-previously just lists of items to be sold-began carrying new information: condition, provenance, even price estimates.

FORBES: Revenge of the Nerds

Online museum inventories, with details of acquisition and provenance, are another rich source of information.

ECONOMIST: Turkey��s cultural ambitions