Patent ID: 8838584

Claim:
A method, comprising: retrieving, in response to a plurality of queries on a topic from a client, by a programmed computer, a plurality of sets of documents from a collection of content sources; enumerating, by the programmed computer, all subsets of documents of the plurality of sets of documents corresponding to all subsets of the collection of content sources; calculating, by the programmed computer, for each subset of the collection of content sources, a count of effectiveness of a corresponding subset of documents and a price of the corresponding subset of documents, wherein said calculating the count of effectiveness of the corresponding subset of document comprises calculating, for each enumerated subset of documents, an equivalent fractional story count, wherein an exact duplicate between two documents of an enumerated subset of documents is counted as a normalized equivalent fractional story count of one, and wherein one document of an exact duplicate between two documents of the enumerated subset of documents is discarded from the subset of documents; selecting a subset of content sources having the highest calculated ratio of count of effectiveness of the corresponding subset of documents to price of the corresponding subset of documents; and delivering the selected subset of content sources and the corresponding subset plurality of sets of documents to the client.