In niche wheat futures market, rebooted legacy contract fends off new offering from giant rival

While the article discusses competition between exchanges in the spring wheat futures market, it's unlikely to have a significant impact on the S&P 500. The spring wheat market is relatively niche, and the battle between CME and MIAX is unlikely to cause broad market volatility. The negative influence comes from the potential for increased volatility in the agricultural sector due to the competition.