There’s still one day left, but the first four days of this week have been fat for Wall Street. A rally that’s already added more than $1.3 trillion to the S&P 500 since Monday powered ahead today, thanks in part to the seeming inevitability of a Federal Reserve rate cut later this month.

Just as Wall Street traders come to grips with the Federal Reserve’s interest-rate cut, Friday’s US options expiration threatens to whipsaw the market some more.Most Read from BloombergAOC Proposes $30 Billion Social Housing AuthorityCalifornia’s Anti-Speeding Bill Can Be a Traffic Safety BreakthroughNew York City’s Transit System Plans $65.