By Dan Weil The Fed already has raised interest rates 3 percentage points since March, putting the federal funds rate at 3% to 3.25%. Some economists and investors expect the Federal Reserve to soon pivot away from its interest-rate-increase campaign, as they anticipate inflation will recede and the economy will slump. But Goldman Sachs economists feel otherwise. They just added an additional rate hike to their forecast – a 25-basis point (0.25 percentage point) increase in March 2023. Rising interest rates make your borrowing, such as mortgage loans, more expensive. But they increase the payo…