We’re only at the beginning of the rate game. German and Japanese 10 yr bonds are negative rates, UK is at 0.23. Banks are forecasting a possible negative rate trend.Market is pricing in 50-75bps next week. Fed doesn't change Prime rate directly, just the short term fed funds rate. As you mentioned, mortgage rates are all priced off the 10yr Treasury and it is already at all time lows. The Fed funds rate is going back to zero, but you have to look at the 10yr to determine the mortgage rate. The market is pushing the action at this point and the Fed is reacting.