Jesus here sets out the principles of private property. First, you are entitled to compensation for your efforts, but only for what you have agreed. Second, you are entitled to do with your property whatever you want. Just like other people cannot say what is "fair" for you, other people cannot say what you should do with what you have.
There is no simple standard for economic value. Every person is free to say what their effort is worth. Every person is free to say what they find valuable.
Christ's Words in Matthew as a Guide to 40 Days of Prayer.