Why might the velocity of money change unexpectedly?

In economics, haste is a term that describes the rotation of plutocrat. Haste of plutocrat in a time is defined as,
$Haste=\frac{\text{Nominal GDP}}{\text{Mancy Supply}}$

Unanticipatedchangein thehasteofplutocratovertimecouldbebecause of thechangeinplutocratforceand itsmatchingeffecton thenominalGDP. Forillustration, consumer'sexpenditurecan speed up ordeceleratedowndependingupon theirneedtobuyalargenumberorparticularssnappily.
Still, also it means that the changes in the plutocrat force affect the nominal GDP in a predictable manner, If the haste changes in a predictable and constant way. On the negative, if it fluctuates unpredictably, also it's apparent that changes in the plutocrat force affect the nominal GDP in an changeable manner.