We study a credible Markov-perfect monetary policy in an open New Keynesian economy with incomplete financial markets. We demonstrate the existence of two discretionary equilibria. Following a shock the economy can be stabilised either "quickly" or "slow", both dynamic paths satisfy conditions...

We investigate financial markets under model risk caused by uncertain volatilities. For this purpose we consider a financial market that features volatility uncertainty. To have a mathematical consistent framework we use the notion of G-expectation and its corresponding G-Brownian motion...