document: An economic model of the worldwide web We believe that much novel insight into the worldwide web can be obtained from taking into account the important fact that it is created , used , and run by selfish optimizing agents : users , document authors , and search engines . On-going theoretical and experimental analysis of a simple abstract model of www creation and search based on user utilities illustrates this point : We find that efficiency is higher when the utilities are more clustered , and that power-law statistics of document degrees emerge very naturally in this context . More importantly , our work sets up many more elaborate questions , related , e.g. , to www search algorithms seen as author incentives , to search engine spam , and to search engine quality and competition .
doc_bio_tags: O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O