>>669973"In monetary terms the value of labour"
The central point of the labour theory of value is that labour is bought by the capitalist below the price is it worth (that is, an hour of labour is worth an hour labour worth of products), because of the class position of the working class which is forced, in competition, to sell their labour, at whatever price they can, and given the capitalists has control over whether they eat or not, it's far below the value it produces, the value it's worth. This difference is the source of profit. Labour is the only thing that can be continuously acquired for less than it costs to reproduce it, this is the source of economic growth.
Exploitation isn't "I should be paid more", it is the very fact that by definition you are never paid more than the value you produce. If you got equal to the value your labour produces, your boss wouldn't make a profit, and thus not hire you, he will only hire you if he can pay you less than the value you produce in return.
"Scientifically determine the value of your labour" is a false demand. There is nothing to be determined. It doesn't change. Your labour is worth exactly and always the equal value it produces. It's axiomatic.
Of course, capitalists reject this axiom, instead choosing economic models that can not predict any prices in any capacity, but only microeconomic mumbo jumbo or unsubstantiated philosophical assertions. Meanwhile, LTV claims all value is created by labour, and comparing profit (value added) in industries Vs the labour hours shows a near perfect relationship, with the exception of intentional monopolistic industries which do not follow price signals or competition.