Gary Gensler, the chair of the SEC.Evelyn Hockstein/Associated PressThe SEC on Wednesday approved a change that will allow some stocks to be quoted in half-penny increments.The measure will narrow bid-ask spreads and reduce costs for investors, the SEC said.As many as 1,700 stocks could be impacted by the change.The US Securities and Exchange Commission has revamped how stocks get priced in an effort to reduce costs on investors.On Wednesday, the SEC voted to adjust market rules, so that some stocks will be quoted in increments of $0.005.