Stocks sank on Thursday in the final session of September and the third quarter, with stocks extending a weeks-long streak of volatility as concerns over inflation, the economic backdrop and debates in Washington over a host of measures weighed on equities. The S&P 500 ended the day lower by 1.2{21df340e03e388cc75c411746d1a214f72c176b221768b7ada42b4d751988996}. […]