If the sentence were correct, your employer would sell whatever you produce for less than what they are paying you for it. E.g. they pay you 20 for one hour of work, in which you produce one product, which they then sell for 15. Obviously they would be making a loss in that situation on every single product sold, so no business would ever do that (except in special cases like loss leaders or limited promotions, of course, but we’re talking about the general case here)
If the sentence were correct, your employer would sell whatever you produce for less than what they are paying you for it. E.g. they pay you 20 for one hour of work, in which you produce one product, which they then sell for 15. Obviously they would be making a loss in that situation on every single product sold, so no business would ever do that (except in special cases like loss leaders or limited promotions, of course, but we’re talking about the general case here)