If you take the amount of money involved in the stock market every year, and assume that as a percentage of the total amount of money sloshing around the economy it remains broadly the same, then owing to monetary expansion (~7-8% a year in the USA), there is that percentage to be extracted from the financial system every year. Which Wall Street is quite efficient at.
If you factor in things like financial feedback loops essentially acting to concentrate money over long periods of time in the financial sector (well, what did you think was causing the ever increasing wealth gap?), then it's a little more than that of course.
If you take the amount of money involved in the stock market every year, and assume that as a percentage of the total amount of money sloshing around the economy it remains broadly the same, then owing to monetary expansion (~7-8% a year in the USA), there is that percentage to be extracted from the financial system every year. Which Wall Street is quite efficient at.
If you factor in things like financial feedback loops essentially acting to concentrate money over long periods of time in the financial sector (well, what did you think was causing the ever increasing wealth gap?), then it's a little more than that of course.