The formula for the currency flow speed is:
V=M1/t/M2.
M1 It is money away from the subject or money away into the subject.(Subject is the person who holds the currency or company or bank, etc)
M2 It is the property of the subject
T Is the unit of time.
Here, the "subject" through which money flows can be individuals, banks, companies, or
even the whole country. These subjects are pipes of money flow, like water pipes of water flow.
If the rate of money circulation between each subject is too different, then a financial crisis could occur. For example, the 2008 subprime crisis in 2008 was because the flow of money was amplified by "CDS", Because the money of customers who buy CDS and investment banks flows too fast, causing the financial crisis, That is, the speed of money flow is too large, causing the capital chain fracture, resulting in the financial crisis
By the way, I know Fisher's equation, and I wrote this is the speed formula of the microscopic money flow, unlike Fisher's. The rate of money flow varies in different parts of economic activity, for example, the speed at which banks borrow money and the speed of workers' income, which are too different can problems. The speed of money flow in Fisher's equations is macroscopic, and many times it is treated as constant. It doesn't say that all parts of an economy are different, it simply says that all parts of the economy are the same. It doesn't say that the currency speed of an economy varies from place to place, It is simply general to give a macroscopic flow velocity.
Preprint Analysis of Financial Crisis Causes and Complex Systems Scie...