Index Option Pricing Models with Stochastic Volatility and Stochastic Interest Rates

This paper specifies a multivariate stochasticvolatility (SV) model for the S & P500 index and spot interest rateprocesses. We first estimate the multivariate SV model via theefficient method of moments (EMM) technique based on observations ofunderlying state variables, and then investigate the respective effects of stochastic interest rates, stochastic volatility, and asymmetric S & P500 index returns on option prices. We compute option prices using both reprojected underlying historical volatilities and the implied risk premiumof stochastic volatility to gauge each model's performance through direct comparison with observed market option prices on the index. Our major empirical findings are summarized as follows. First, while allowing for stochastic volatility can reduce the pricing errors and allowing for asymmetric volatility or leverage effect does help to explain the skewness of the volatility smile, allowing for stochastic interest rates has minimal impact on option prices in our case. Second, similar to Melino and Turnbull (1990), our empirical findings strongly suggest the existence of a non-zero risk premium for stochastic volatility of asset returns. Based on the implied volatility risk premium, the SV models can largely reduce the option pricing errors, suggesting the importance of incorporating the information from the options market in pricing options. Finally, both the model diagnostics and option pricing errors in our study suggest that the Gaussian SV model is not sufficientin modeling short-term kurtosis of asset returns, an SV model withfatter-tailed noise or jump component may have better explanatory power.     

The integrability of generalized working models

This paper demonstrates the integrability of the generalized Working (1943) model as proposed by Laitinen, Theil and Raparla (1983).     

Technology transfer through technological attachés: The Belgian experience

This paper explains briefly how the economic recession was at the origin of Belgium's policy of technology transfer through technological attachés. The formal decision to start a network of attachées soon raised problems that required some profound thinking about their strategic and functional organization. This experience and the pragmatic approach that has been followed may be useful where similar initiatives are considered.     

Economische orde,economische politiek en sociale politiek

Naar aanleiding van een bundel opstellen van dr J. Zijlstra, Economische Orde en Economische Politiek, H. E. Stenfert Kroese N.V., Leiden 1956, 143 blz. en een bundel opstellen van dr G. M. J. Veldkamp, Economische Orde en Sociale Politiek, H. E. Stenfert Kroese N.V., Leiden 1957, 156 blz.     

Corporate monopoly power and risk

The relationship between monopoly power and concentration may be influenced by the ‘riskiness’ of the firm. Two related issues are considered in this paper: the impact of market structure and conduct on the risk of the firm and the impact of risk upon the relationship between profitability and concentration. An a priori relationship between risk, market structure and profitability is derived within the mean-variance framework of the Capital Asset Pricing Model.     

The double dividend and the role of inequality aversion and macroeconomic regimes

The introduction of the European Community's carbon-energy tax in a small open economy is analyzed by comparing two kinds of revenue recycling. We use a dynamic general-equilibrium model with different regimes for the labor market, several income groups, and a crude valuation of environmental benefits. This allows for a more comprehensive empirical test of the double-dividend hypothesis, including equity aspects. It is shown that the weak double-dividend hypothesis can fail when equity aspects are taken into account.     

FHA Terminations: A Prelude to Rational Mortgage Pricing

Recent models of pricing mortgages and/or mortgage insurance have used option-pricing models as their framework. The focus is usually on default, which is viewed as a put option (to sell the house to the lender in exchange for the mortgage) and prepayment, which is viewed as a call option (to buy the mortgage from the lender). Analysis then uses techniques like those used to price options in capital markets. Unfortunately, homeowners do not seem to exercise their option as quickly as do traders in organized markets. We estimate prepayment and default functions, which are meant to be a first step in developing modified, option-based models of mortgage pricing.     

The Equity Premium: Consistent with GDP Growth and Portfolio Insurance

We find that the long‐term equity premium is consistent with both GDP growth and portfolio insurance. We use a supply‐side growth model and demonstrate that the arithmetic average stock market return and the returns on corporate assets and debt depend on GDP per capita growth. The implied equity premium matches the U.S. historical average over 1926–2001. Separately, we find that the equity premium tracks the value of a put option on the S&P 500. Our theory predicts a smaller equity premium in the future, assuming that the recent regime shifts in dividend policies, interest rates, and tax rates are permanent.