In certain cases, patents may be valued using the techniques developed for financial options, as applied via a real options framework. The key parallel is that a patent provides its owner the right to exclude others from using the underlying invention, so both patents and stock options represent a right to exploit an asset in the future, and to exclude others from using it. The patent (option) will have value to the buyer (owner) only to the extent that the expected price in the future exceeds the opportunity cost of earning just as much in a risk-less alternative. Thus patent rights can be thought of as corresponding to a call option and may be valued correspondingly. See Option pricing approaches under Business valuation for further discussion.