As The Federal Reserve tries to fight inflation (it can’t thanks to Federal energy policies and bottlenecks), it is causing a disconnect between mortgage current coupon rate and the MBS index coupon. The disconnect is so bad that it is back to 1985 levels.
The Fed can certainly try to cool inflation, but Biden is intent on raising energy prices (leading to food price increases, and everything else) to shift us to electric cars. So, Biden is unlikely to back off.
So, The Fed is left trying to fight a war against inflation that only Biden can fight.
Meanwhile, the US mortgage market is getting pulverized
