> The owner takes the risk that there is no (or negative) money left over after paying employees and all other costs.

This is not true, and somewhat confusing, because "takes the risk" means two distinct things - making decisions and living with the consequences of them. Economic production is a collective effort. The management of the company is who usually makes the decisions; these might coincide with owner (especially in small business) but often they're just another employee.

On the other hand, bad decisions made by management affect everyone in the company, not just the owner. The rich enough owner rarely lose their livelihood (we have limited liabilities btw), but the employees might lose the only source of income.

And the system where you have only one person (owner as main manager) making decisions ("take risks") that can negatively impact many people (his employees, customers and what not) is structurally risky, it actually increases the risk of something going wrong (aside from it being a moral hazard). (POTUS is an extreme example of this.) The risk is shared (collectively owned, if you will) and so should be the decision-making.