In order to manufacture some medications, a U$.$S$.$ pharmaceutical company needs a certain mineral it can only import from Australia. In turn, companies in Australia need a certain type of plastic that they must import from Germany. Germany needs the medications created by the U$.$S$.$ pharmaceutical company. Germany provides Australia with the plastic, Australia provides the U$.$S$.$ with the mineral, and the U$.$S$.$ provides Germany with the medicines. This beneficial exchange is a form of