Contract Theory Contract theory contract theory. game theory English the econ kind game theory game theory incomplete http://en.wikipedia.org/wiki/Contract_theory contract theory Contract Theory contract theory English English English https://en.wikipedia.org/wiki/Contract_theory Contract theory https://en.wikipedia.org/wiki/Contract_theory Contract theory 契約理論 English the system to obey two constraints: Contract theory English Contract theory the system to obey two constraints: contract theory incomplete