It's called the second derivative aka. deceleration. Dunces have never heard of it...unfortunately continual debt expansion doesn't "do" deceleration...
Copper with global growth rate
"Our five year forecast changes every three months"
"The International Monetary Fund cut its global growth forecasts for the third time in less than a year on Tuesday, as new figures from Beijing showed that the Chinese economy grew at its slowest rate in a quarter of a century in 2015.
To back its forecasts, the IMF cited a sharp slowdown in China trade and weak commodity prices that are hammering Brazil and other emerging markets."