A non-stationary regression model for financial returns is examined theoretically in this paper.Volatility dynamics are modelled both exogenously and deterministic, captured by a nonparametriccurve estimation on equidistant centered returns. We prove consistency and asymptotic normalityof a...

In this paper we first investigate the validity of a general Value at Risk approach, which iswidely used for risk management in banking and insurance companies. We discuss and widely rejectthe conventional assumptions, e.g. independent identically distributed normal returns, and as...

In the literature, implied rates of return are suggested as estimators for future expected oneperiodreturns because of their property not being prone to the discount rate effect. The discount rateeffect describes the problem that changes in expected future one-period returns lead to...

Derivative financial instruments are frequently used as a tool for influencing the risk ofentrepreneurial uncertain payoff. To this end, an approximation procedure is developed capable ofcalculating the optimal quantity of derivatives to be used. It is assumed that the entrepreneurial cashflow...

Investors need performance measures particularly as a means for funds selection inthe process of ex-ante portfolio optimization. Unfortunately, there are various performancemeasures recommended for different decision situations. Since an investor may be uncertainwhich kind of decision problem is...

The requirement of existing utility with positive first derivative only makes it pos-sible to derive a restricted two-fund separation theorem for portfolio selection problems withHARA utility replacing the original separation theorem of Cass and Stiglitz (1970). We useour findings for a brief...

We consider investors with mean-variance-skewness preferences who aim at select-ing one out of F different funds and combining it optimally with the riskless asset and directstock holdings. Direct stock holdings are either exogenously or endogenously determined. Inour theoretical section, we...

Immer wieder kann man beobachten, dass Menschen gleichzeitig Versicherungsverträge ab-schließen und an Lotterien teilnehmen. Gemein haben Versicherungsverträge und Lotterien,dass man aus diesen Transaktionen als Versicherungsnehmer bzw. Lotterieteilnehmer im Mit-tel, genauer: im...

Gegenstand der deskriptiven Entscheidungstheorie ist die Erklärung realen menschlichenEntscheidungsverhaltens. Spätestens seit den Arbeiten von Allais (1953) war dabei bekannt,dass das auf die Maximierung des erwarteten Nutzens von Entscheidern abstellende Bernoul-li-Prinzip wohl als Postulat...

"Coherent" measures of a bank's whole risk capital imply a structure of a bank's optimalcredit portfolio that is independent of its deposits and the expected deposit rate, of expectedbankruptcy costs and of expected costs of regulatory capital...