How to Interpret the Shape of the Yield Curve
Historically most recessions in the US are preceded by significant declines in the differential or interest rate spread between the 10-year T-bond and the 3-month Treasury security. Typically, this narrowing in the spread occurs many months before the onset of the recession.
Conversely, the widening in the spread occurs many months before the beginning of the economic recovery.
What is the reason for these changes in the interest rate spread?