Your description sounds very much like
https://en.wikipedia.org/wiki/Exploitation_of_labour :
> Marx's exploitation theory is one of the major elements analyzed in Marxian economics and some social theorists consider it to be a cornerstone in Marxist thought. ...
> Exploiters appropriate another's surplus labour, which is the amount of labour exceeding what is necessary for the reproduction of a worker's labour power and basic living conditions. ...
> Once capitalists are able to pay the worker less than the value produced by their labour, surplus labour forms and this results in the capitalists' profits. This is what Marx meant by "surplus value", which he saw as "an exact expression for the degree of exploitation of labor-power by capital, or of the laborer by the capitalist".[9] This profit is used to pay for overhead and personal consumption by the capitalist, but was most importantly used to accelerate growth and thus promote a greater system of exploitation.
When I read your original comment I was reminded of the presentations of the Marxian economist Richard D. Wolff, eg, from https://www.peoplesworld.org/article/understanding-marxism-u... :
> The heart of Wolff’s argument centers on what Marx called “surplus labor,” which is what employers appropriate above what they pay for wages. After further deducting raw materials, machinery and the like used in the production process, what’s left is the employer’s profit.
> Wolff maintains that the fact that productive workers are not compensated for the full amount and worth of their labor constitutes “exploitation.”
I think it's understandable why I saw them as being similar.
Is the main difference between you and Marxian thought that you don't consider the difference to be "exploitation"?
You wrote: "It is clearly impossible for an employee to be making more than they bring money into the business. Otherwise the business wouldn't exist."
The Wikipedia page gives some criticisms to that Marixan view, which also hold for your statement: "They suggest that Marx should have allowed for two things; namely, permit a fair profit on the risk of capital investment and allow for the efforts of management be paid their due. "