Taisei Corporation, a Japanese company, negotiated a deal with a foreign country in which Taisei Corporation will build Marmaraya rail transport project in the Turkish city of Istanbul. The project comprises an undersea rail tunnel under the Bosphorus Strait and the modernization of existing suburban railway lines along the Sea of Marmara. The Taisei Corporation agrees to be repaid with part of the resulting output from the transportation system (that is, the fees collected to ride the subway) as partial payment over a 20-year period. This is an example of __________