Assume that two countries Partner and RoW have the export supply functions:
Partner: XSP = P - 1, RoW: XSR = P - 2. Assume further that a 3rd country Home has the import demand function: Home: MD = 12 - P
Assume that Home levies a specific MFN tariff T of 1 on all imports. Derive the export supply curve XSMFN. Find the domestic price P, quantity imported M and border price P - T. How much tariff revenue is collected and what is the export supply XR from RoW and XP from Partner?