American consumers are used to being part of a vast high-tech credit world that tracks financial identities and creditworthiness using sophisticated algorithms. The roots of this system reach back to the 19th century, when credit clerks kept detailed handwritten notes and "correspondents" reported on the character of local business owners to try to help lenders determine who was more likely to repay debts. In his new book, Creditworthy , Josh Lauer, UNH associate professor of media studies,