I have heard so many stories of contractors, and I've met some, too, who worked for Donald Trump, produced the goods and services and never got paid for what they were owed.
The material universe must consist. . . of bodies. . . such that each of them exercises its own separate, independent, and invariable effect, a change of the total state being compounded of a number of separate changes each of which is solely due to a separate portion of the preceding state.