Describe how the S&P 500 has performed since the beginning of August 2023. Describe how long-term interest rates (use 10-year Treasury yields) have changed over the same period. What does the slope of the yield curve suggest about investors expectations of future short-term interest rates? What do the observed changes in long-term interest rates suggest about investors expectations of future short-term interest rates? Is the yield curve more or less steeply downward sloping now than it was at the beginning of August 2023?