What is the fine-grained topic of the following text: He was a principal architect of the first internal corporate markets, at Xanadu in 1990, of the first web markets, the Foresight Exchange since 1994, of DARPA’s Policy Analysis Market, from 2001 to 2003, and of IARPA’s combinatorial markets DAGGRE and SCICAST from 2010 to 2015. Only return the topic.
The architect's contributions to the development of various corporate and web markets.