AS COMPUTING power has grown, it has become easier to uncover information hidden inside datasets that seem totally unconnected. Some recent studies have used this approach to reveal business-related information flows. One linked the movements of 18th-century share prices with the arrival of ships bringing news. Another looked at the relationship between business activity and the movements of corporate jets. A third mined White House visitor logs for the names of executives and examined their companies’ subsequent stockmarket returns.
A paper in this vein published on March 5th pores over a dataset released by New York City’s government covering more than 1bn cab rides between 2009 and 2014. David Finer, a graduate student at University of Chicago’s Booth School of Business, analysed trips connecting the headquarters of big banks and the Federal Reserve Bank of New York. He extracted trips starting at commercial banks and at the New York Fed that converged on the same destination around…
