Back-testing system?
fbbwsa: yes, i'd be interested in seeing it put on the web for use. for casual observers, this is interesting.no, i don't think it could be built into a viable online business. most people who have backtesting needs have access to the necessary data via existing subscription services.unless a new service provides "cleaner" data and more breadth than existing services, it'd be hard to be competitive.the consumers in this market are relatively insensitive to price, so that wouldn't be seen as a significant advantage either.