“In 1974, economist Julius Shiskin came up with a few rules of thumb to define a recession: The most popular was two consecutive quarters of declining GDP. A healthy economy expands over time, so two quarters in a row of contracting output suggests there are serious underlying problems, according to Shiskin. This definition of a recession became a common standard over the years.”
Source -
https://www.forbes.com/advisor/inves...s-a-recession/