Yes, and no. The value we place on our own labour is subjective, and the value that a buyer places on our labour is also subjective. You may value your labor at $100/hour, and if no one agrees to pay that price that doesn't mean you are wrong, it just means that there's no market for your labour at that amount.
At the same time, we can say that there is an objective value for labour of a certain type (I'm thinking of commodified labour), which is the going market rate. Just as there is, at any given point in time, an objective value for a share of Apple Computer.