Key TakeawaysThe S&P 500 added 0.3% on Tuesday, Sept. 24, as a report showed a slump in consumer confidence and China unveiled an economic stimulus package.Shares of mining giant Freeport-McMoRan soared as copper prices jumped following Beijing's monetary policy announcement.Visa shares tumbled after the U.S. Department of Justice filed an antitrust lawsuit against the credit card issuer. Major U.S. equities indexes ticked higher on Tuesday, shaking off a report that revealed a steeper-than-expected drop in ...