 The Dow is rallying up more than 600 points after a record close yesterday. Goldman Sachs economists now say the Federal Reserve should cut interest rates later this month. Traders are pricing in a September cut. Shares of UnitedHealth and Caterpillar are helping to push the Dow higher. UnitedHealth reported an upbeat quarter. Shares up more than 5%. Caterpillar would benefit from lower interest rates. The stock up more than 2%.