The book says that usually an increase in ST rates leads to higher mid and LT yields. However, that they may actually fall, if interest rates increase is gauged sufficient to slow the economy.
Can someone explain this relationship. Also, why would rates generally rise in the mid and LT? It makes more sense for me that they fall given expectation of lower economic activity and lower inflation.
If you believe the liquidity preference theory for explaining the shape of the yield curve, than an increase in short-term yields is likely to result in an increase in mid-term and long-term yields as investors in each would demand a liquidity premium over the (new, higher) short-term rate.