• The US stock market is finally as fast as it was about a hundred years ago.
• That was the last time share trades in New York settled in a single day, as they will from Tuesday under new Securities and Exchange Commission rules. The change, halving the time it takes to complete every transaction, also occurred in jurisdictions including Canada and Mexico on Monday.
• The switch to the system known as T+1 — abandoned in the earlier era as volumes became unwieldy — is ultimately intended to reduce risk in the financial system. Yet there are worries about potential teething issues, including that international investors may struggle to source dollars on time, global funds will move at different speeds to their assets, and everyone will have less time to fix errors.