(AP) — Wall Street is beginning 2021’s first trading day mostly flat, amid tempered optimism about the rollout of coronavirus vaccines. The S&P 500 was up less than 1 point at 9:35 Eastern time, while the Dow Jones Industrial Average was down 62 points. Vaccine development by U.S., European and Chinese producers has raised hopes a return to normal might be closer after the global economy’s worst decline since the 1930s. That’s offset by concern over rising infection numbers in the U.S. and some other countries and conflict in Washington over economic aid. London and Frankfurt opened higher. Asian markets rose slightly.