Answer:
It is tough to calculate, but to calculate the limit of money in the world, there are some factors involved.
Every country has a primary substance to mesure its wealth. Most of the countries consider Gold as a parameter. So the addition of cost of all those available substances is the total wealth of the world.
To answer this: Considering that all countries consdier Gold as their promary welath factor, the total cost of gold available worlwode is the total money in the world