Traders work on the floor at the New York Stock Exchange (NYSE) in Manhattan, New York City, U.S., March 7, 2022.Traders work on the floor at the New York Stock Exchange (NYSE) in Manhattan, New York City, U.S., March 7, 2022.

The yield on the two-year and 10-year Treasurys inverted for the first time in over a year on Thursday, raising the possibility of a recession.

The rate of the 2-year note is higher than the 10-year note because of the bond market phenomenon.

This part of the yield curve is watched closely by investors because they believe that the economy could be headed for a downturn. The 2-year to 10-year spread was negative for the first time in 2019.

The yield on the 10-year Treasury fell to 2.331%, while the yield on the 2-year Treasury was at 2.337% at one point. Both yields were basically at the 2.34% level in the latest trading.

The spread can be monitored in real time.

There has been a better than two-thirds chance of a recession at some point in the next year and a greater than 98% chance of one in the next two years.

CNBC data did not confirm the inverted 2-10 spread until now, but some data providers showed it for a few seconds earlier Tuesday. Many economists believe that the curve needs to stay inverted for a long time before it gives a signal.

Think about what the yield curve means for a bank when looking at the importance of the yield curve. The yield curve is a measure of the spread between a bank's cost of money and what it will make by lending it out or investing it over a longer period of time. Economic activity slows if banks can't make money.

While the yield curve is reliable in sending signals about pending recessions, there is often a long time lag before investors need to fear a recession is around the corner.

Some of the other signals could include a sudden increase in unemployment, or early warnings in ISM that manufacturing activity could be slowing. The yield curve could reverse if the Federal Reserve paused in its rate-hiking cycle or if there was a resolution to the war in Ukraine.

The yield curve inverted 423 days before the 2001 recession, 571 days before the 2007-to-2009 recession and 163 days before the 2020 recession.

Most of the time, a recession is a sign, but not all of the time, according to the head of equity, derivatives and quantitative strategy at Evercore ISI. He noted that the economy avoided a recession in 1998 when the Russian debt crisis and Long Term Capital Management failed.

The last 30 years has been a good one, with few recessions that you don't want to say something is a golden rule.

The stock market continued to perform well after six instances where the 2-year and 10-year yields inverted. The S&P 500 was up an average of 1.6% a month after the inversions but was up an average of 13.3% a year later.

The stock market does not peak until between two and 12 months prior to the start of a recession, but in most cases there is a recession over the long haul.

There is a 25% chance of a recession in the U.S.

The yield curve is not as reliable as it used to be because the Federal Reserve has become a big player in the market, according to some bond pros. The 10-year note and 30-year bond should be higher because strategists believe the Fed has suppressed interest rates at the long end.

The 10-year yield could be closer to 4% if the Fed hadn't done quantitative easing. The yield curve for the 2-year and the 10-year would be 100 basis points apart if it weren't for the central bank's bond-buying program. The basis point is 0.01%.

The part of the curve most reflective of Fed rate hikes is where the 2-year yield has climbed most rapidly. The 10-year has been held back by flight-to-quality trades as investors keep an eye on the Ukraine war. The yields move in opposite directions.

The 3-month yield to the 10-year yield is thought to be a more accurate recession forecaster by some market pros. The widening of that spread is a sign of better economic growth.