Inflation in the US and the possibility of an interest rate increase puts pressure on the bond market.
Reuters: The publication of higher-than-expected inflation statistics in the United States and the strict stances of central bank officials in this country escalated concerns about the sharp increase in interest rates by the "Fedal Reserve" (the US central bank) in December and led to a decline in the bond market and an increase in the yield on US bonds and other US bonds.
Irna Jahan