1. "When domestic and foreign bonds are perfect substitutes, a central bank should be indif- ferent about using domestic or foreign assets to implement monetary policy." Discuss.

2. U.S. foreign exchange intervention is sometimes done by an Exchange Stabilization Fund, or ESF (a branch of the Treasury Department), which manages a portfolio of U.S. government and foreign currency bonds. An ESF intervention to support the yen, for example, would take the form of a portfolio shift out of dollar and into yen assets. Show that ESF interventions are automatically sterilized and thus do not alter money supplies. How do ESF operations affect the foreign exchange risk premium?