Model uncertainty,recalibration, and the emergence of delta–vega hedging

We study option pricing and hedging with uncertainty about a Black–Scholes reference model which is dynamically recalibrated to the market price of a liquidly traded vanilla option. For dynamic trading in the underlying asset and this vanilla option, delta–vega hedging is asymptotically optimal in the limit for small uncertainty aversion. The corresponding indifference price corrections are determined by the disparity between the vegas, gammas, vannas and volgas of the non-traded and the liquidly traded options.     

Gender Effects of Social Security Reform in Chile

In 1981 Chile replaced a mature government-run social securitysystem that operated on a pay-as-you-go basis with a privatelymanaged system based on individual retirement accounts. Thenew system is more fiscally sustainable because pension benefitsare defined by contributions. The minimum pension guaranteedto beneficiaries with at least 20 years is funded from generaltaxes, preserving the tight matching between contributions andbenefits. The new system also eliminates several cross-subsidies.Men and women with less than secondary education gain underthe new system, but single women with more education lose. Comparisonof the old and the new systems reveals a complex set of factorsthat cause gender effects given constant behavior or changebehavior across genders.     

Hedge-Fonds als Asset-Klasse: Betrachtungen aus der Perspektive der deutschen Versicherungswirtschaft

The over performance of hedge funds until the current financial market turbulences led to a large number of insurers increasing their hedge funds quota. In the following this asset class is examined and particularly analyzed with respect to its adequacy for an insurance company's asset allocation by focusing on the axiom of safety, as demanded by national law. The problem of survivorship-bias and the Markowitz requirements of normal-distribution and constant correlations among the asset classes and their impact on a strategic asset allocation are studied.     

Control rights, pyramids, and the measurement of ownership concentration

The recent corporate governance literature has emphasised the distinction between control and cash-flow rights but has disregarded measurement issues. Control rights may be measured by immediate shareholder votes, the voting rights as traced through ownership chains, or voting power indices that may or may not trace ownership through chains. We compare the ability of various measures to identify the effects of ownership concentration on share valuation using a German panel data set. The widely used weakest-link principle does not perform well in this comparison. Furthermore, measures that trace control through ownership chains do not outperform those that rely on immediate ownership, thus questioning the role of pyramids in the separation of control and cash-flow rights. The paper emphasises that there is a distinction between these two aspects of ownership even without pyramids or preferred stock, identification of which requires measures that, like the Shapley–Shubik index, do not simply equate control rights with voting rights.     

Taxing transactions in futures markets: Objectives and effects

In the last few years various legislative proposals have been made to impose a transaction or excise tax on securities and derivative market transactions. Although there have been considerable discussion and analysis of the wisdom of imposing such a tax on securities markets, there has been no analysis of the pros and cons of extending the tax to futures markets. This article attempts to fill this gap, first, by examining the various rationales advanced to support a tax on securities markets to determine their applicability to futures markets and, second, by analyzing the likely effects of the tax on the competitiveness and efficiency of futures markets. In addition, the revenue-raising potential of a tax on futures transactions is evaluated. I conclude that a tax on futures markets will not achieve any important social objective and will not generate much revenue.     

EXCHANGE RATE MISALIGNMENT IN DEVELOPING COUNTRIES

This article analyzes the theory of equilibrium real exchangerates and defines misalignment as a deviation of the real exchangerate (RER) from its equilibrium level. The role of macroeconomicpolicies is then analyzed under three alternative nominal exchangerate regimes: predetermined nominal exchange rates, floatingnominal rates, and dual or black market nominal exchange rates.This discussion points out how inconsistent macroeconomic policiesoften lead to real exchange rate misalignment. Corrective measures,including nominal devaluations and several alternative approaches,are then evaluated.