Digitisation meant that trades within, as well as between, stock exchanges could happen faster and faster. As the actual trading passed into the hands of machines, it became possible to react almost instantaneously to any price change or new offer. But being able to react meant both understanding what was happening, and being able to buy a place at the table. Thus, as in everything else, digitisation made the markets both more opaque to noninitiates, and radically visible to those in the know.
