Multifactor Interest Rate Models in Low-Rate Environments

This thesis studies a multi-factor Heath-Jarrow-Morton model and a LIBOR mar-ket model on the Norwegian, European and US interest rate market. The mainconcerns are the low-rate environment and exposure to negative interest rates inthese models. We begin by introducing financial markets and the mathematicalmodels explaining them. Further we discuss the problem with the current low-rateenvironment and the historical market practice. The focuses are implementationsof two multi-factor interest rate models and the presence of negative interest rates.The historical data is provided by DNB and consists of zero coupon swap rates forseveral maturities in the period 2000-2012. The volatility factors are derived fromhistorical data using principal component analysis and covariance matrices. Withtoday?s yield curve the probability of negative rates is highly significant in the HJMmodel, whereas it is zero in LMM because of lognormality. Monte Carlo is used onthe models to compare prices of caps and floors. We show that the models do notproduce the same price especially around strikes near the current 3-month rates.Further we price long butterfly spreads to show the absence of arbitrage in bothmodels.