The size of the financial industry bears no relation to the economy. Self-mythological panegyrics aside, the finance industry confiscates money; it doesn’t create it. How much? Get out your calculators, and maybe you’ll have to find a way to add a couple of digits to what your screen can hold.
Perhaps the total amount of money extracted by financiers (or, more to the point, speculators) is not quite as large as Douglas Adams’ description of space in the, yes, increasingly inaccurately named Hitchhikers’ Trilogy, as “Really big. You just won’t believe how vastly hugely mind-bogglingly big it is.” But it’s close.