当工人可以选择为老板工作时，工人如何被剥削？

Under Marxist theory, workers are being exploited for their labor and not receiving the full value of their labor. Workers however have a choice in who they work for and how much they earn so how can it be called exploitation? If it because they starve if they do not work, is this not falsified by welfare states, as well as being irrelevant since from what I understand, you still are forced to work if you wish to eat in socialist society, only you have even less say in how much you work for as it is dictated by socially necessary labor time, which is not determined by an individual.Under Marxist theory, workers are being exploit