It's an idiotic point for two reasonsL
1) He conflates wealth with income
2) If wealth were truly zero sum then GDP would never increase.
But Dad has a crack addiction so is hardly in any shape to use logic.
"There is only so much corporate income in a given year. The more of that income that is used to pay workers, the less profit the corporation makes. The less profit, the less the stock goes up. The less the stock goes up, the less the CEO and the investors make. It’s as simple as that. Profit equals income minus expenses. No more, no less. Subtract the right side of the equation from the left side and the answer is always zero. Hence the term, “zero-sum.”
TO COMPLEX FOR YOU HUH?
What you've said is that corporate income for a given year is corporate income for a given year. It's a tautology. If we look at a snapshot of the economy at a point in time, of course it isn't going to change because you are not looking at what happens over time. You're looking at a single point in time.
Your sylogism is an exercise in pure idiocy.
Furthermore, if you judge the "sum" of transaction purely in terms of money, you have failed to consider the fact that the government creates hundreds of billions of dollars every year simply by changing some ones and zeros stored in a computer.
I could go on and on ripping your "logic" to shreds, but I have a life to live.
Dad is an obvious crack addict so critical thinking isnt within the realm of possibility.