Finance - Research Publications
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ItemEvaluation and management of patients with noncardiac chest pain.(Hindawi Limited, 2008)Up to a third of patients undergoing coronary angiography for angina-like chest pain are found to have normal coronary arteries and a substantial proportion of these individuals continue to consult and even attend emergency departments. Initially, these patients are usually seen by cardiologists but with accumulating evidence that the pain might have a gastrointestinal origin, it may be more appropriate for them to be cared for by the gastroenterologist once a cardiological cause has been excluded. This review covers the assessment and management of this challenging condition, which includes a combination of education, reassurance, and pharmacotherapy. For the more refractory cases, behavioral treatments, such as cognitive behavioral therapy or hypnotherapy, may have to be considered.
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ItemExplicit neural signals reflecting reward uncertainty(ROYAL SOC, 2008-12-12)The acknowledged importance of uncertainty in economic decision making has stimulated the search for neural signals that could influence learning and inform decision mechanisms. Current views distinguish two forms of uncertainty, namely risk and ambiguity, depending on whether the probability distributions of outcomes are known or unknown. Behavioural neurophysiological studies on dopamine neurons revealed a risk signal, which covaried with the standard deviation or variance of the magnitude of juice rewards and occurred separately from reward value coding. Human imaging studies identified similarly distinct risk signals for monetary rewards in the striatum and orbitofrontal cortex (OFC), thus fulfilling a requirement for the mean variance approach of economic decision theory. The orbitofrontal risk signal covaried with individual risk attitudes, possibly explaining individual differences in risk perception and risky decision making. Ambiguous gambles with incomplete probabilistic information induced stronger brain signals than risky gambles in OFC and amygdala, suggesting that the brain's reward system signals the partial lack of information. The brain can use the uncertainty signals to assess the uncertainty of rewards, influence learning, modulate the value of uncertain rewards and make appropriate behavioural choices between only partly known options.
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ItemMarkowitz in the brain?(Editions Dalloz, 2008)Brain-scanning (fMRI) evidence is presented that activity in certain sub-cortical structures of the human brain correlate with changes in expected reward, and with risk. Risk is measured by variance of payoff, as in Markowitz’ theory. These brain structures form part of the dopaminergic system (which consists of the neurons that emit a crucial chemical, namely, dopamine, and the areas to which the dopamine neurons project). The dopaminergic system has been known to regulate reward expectation. We show that it is involved in risk perception as well. As such, our findings support for the human brain what recently had been discovered in the primate brain (using single-neuron analysis instead of fMRI).
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ItemInformed trader usage of stock vs. option markets: Evidence from hedge fund investment advisors(SSRN Electronic Paper Collection, 2008)
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ItemTwo Paths to Financial Distress(European Financial Management Association, 2008)
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ItemAnalysts’ recommendation changes or disagreements with market consensus: from which signal does the market take its lead?(European Financial Management Association, 2007)
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ItemManagerial perspectives on corporate finance decisions(Accounting and Finance Association of Australia and New Zealand, 2008)
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ItemTime varying short-horizon return predictability(SSRN Electronic Paper Collection, 2008)
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ItemTHE RELATIONSHIP BETWEEN DIRECTOR INDEPENDENCE, REPUTATION AND MANAGEMENT EARNINGS FORECASTS(Virtus Interpress, 2008)
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ItemTakeovers, Ownership, and Shareholder Wealth — The Australian Evidence(Emerald, 2005-03-01)We examine the relationship between value, ownership, and governance structures for a set of acquisitions by Australian companies over the period of 1994–2001. We find that the propensity to diversify increases with the equity ownership of firms' directors, whereas the composition of the board, the presence of block holders and their ownership does not materially affect the decision to diversify. Board size has a positive but weak impact on the tendency to diversify. We also find no significant negative wealth effects for the shareholders of diversifying firms, although in comparison the shareholders of non‐diversifying acquirers experience significantly positive upward revisions of firm values. Although method of payment influences acquirer returns, ownership and governance do not have any impact on announcement period returns. Our results support the notion that capital markets may consider the ownership and governance structures as exerting enough influence to overcome any costs imposed by diversification strategies, hence limiting value loss to the shareholders.