Inside the <Emphasis FontCategory="SansSerif">“</Emphasis>black box<Emphasis FontCategory="SansSerif">”</Emphasis> of private in-house meetings

We examine information content and related insider trading around private in-house meetings between corporate insiders and investors and analysts. We use a hand-collected dataset of approximately 17,000 private meeting summary reports of Shenzhen Stock Exchange firms over 2012–2014. We find that these private meetings are informative and corporate insiders conducted over one-half of their stock sales (totaling $8.7 billion) around these meetings. Some insiders time their transactions and earn substantial gains by selling (purchasing) relatively more shares before bad (good) news disclosures while postponing selling (purchasing) when good (bad) news is to be disclosed in the meeting. Finally, we conduct a content analysis of published meeting summary reports and find that the tone in these reports is associated with stock market reactions around (1) private meetings themselves, (2) subsequent public release of private meeting details, (3) subsequent earnings announcements and (4) future stock performance.     

Minimal <Emphasis Type="Italic">q</Emphasis>-entropy martingale measures for exponential time-changed Lévy processes

We consider structure preserving measure transforms for time-changed Lévy processes. Within this class of transforms preserving the time-changed Lévy structure, we derive equivalent martingale measures minimizing relative q-entropy. They combine the corresponding transform for the Lévy process with an Esscher transform on the time change. Structure preservation is found to be an inherent property of minimal q-entropy martingale measures under continuous time changes, whereas it imposes an additional restriction for discontinuous time changes.     

Do equity-based <Emphasis Type="Italic">Sukuk</Emphasis> structures in Islamic capital markets manifest the objectives of Shariah??

The Islamic capital market is an important component of the overall Islamic financial system especially in providing an element of liquidity to the otherwise illiquid assets. Like its conventional counterpart, Islamic capital markets complement the investment role of the Islamic banking sector in raising funds for long-term investment. These long-term investments are facilitated through various Shariah contracts and instruments ensuring efficient mobilisation of resources and their optimal allocation. This article aims at reviewing equity-based Sukuk structure, which is one of the most popular instruments used in Islamic capital market today. This article argues that some innovations made in structuring Sukuk, which try to achieve the same economic outcome like conventional instruments, distort the vision of Islamic economics based on justice and equitability. These visions are deeply inscribed in the objectives of Shariah, also known as Maqasid al-Shariah. This distortion stems from the restricted view of understanding Shariah, by only focussing on the legal forms of a contract rather than the substance especially when structuring a financial product. The overemphasis on form over substance leads to potential abuse of Shariah principles in justifying certain contracts, which in fact are contradictory to the Shariah text and ultimately undermining the higher objectives of Shariah. In the final analysis, this article concludes that the substance of a contract that has greater implications to the realisation of Maqasid al-Shariah should be equally looked into. Otherwise, Islamic finance just appears as an exercise of semantics; the functions and operations are really no different from conventional banks, except in the use of euphemisms to disguise interest and circumvent the many Shariah prohibitions.     

Banking Products: You <Emphasis Type="Italic">Can</Emphasis> Take Them with You,So Why Don’t You?

Policymakers around the world call for more competition in the banking sector. One prerequisite to achieving this is customer mobility. Despite its policy relevance, surprisingly little is known about consumers’ bank switching behaviour. We show that the principal reasons to stay at one’s bank are a good bank-customer relationship, practical barriers, and the perception that there is not much benefit in switching. Moreover, we find that the reported propensity to switch varies across banking products. For the main current and savings accounts, this propensity is most strongly related to the bank-customer relationship, while for mortgage loans it is especially linked to switching experience. These findings have important implications for antitrust policy; they provide an argument against using a cluster-based legal standard for the analysis of competition and in favour of a disaggregated approach. Regarding the effectiveness of hypothetical policy initiatives to lower switching barriers, we find that the reported switching propensity with current accounts is higher in the case of account number portability, while more knowledge of the existing switching service has no significant effect. Lastly, scenario analysis shows that a policy of allowing new foreign banks to enter the savings market is less promising for enhancing mobility than a policy that increases the number of domestic players.     

Die <Emphasis Type="Italic">Zeitschrift für die gesamte Versicherungswissenschaft</Emphasis> bleibt die Zeitschrift für alle Disziplinen der versicherungswissenschaftlichen Forschung

Ohne Zusammenfassung     

<Emphasis Type="Italic">K</Emphasis>-fold cross validation performance comparisons of six naive portfolio selection rules: how naive can you be and still have successful out-of-sample portfolio performance?

Recent research reports that optimal portfolio selection models often perform worse than equal-weight naive diversification in out-of-sample testing. This paper extends this line of inquiry by comparing the out-of-sample performance of the equal-weight naive strategy to the out-of-sample performance of five alternative naive strategies, each of which derives from a simple heuristic that does not require any optimization. Out-of-sample portfolio performance is assessed by mean, standard deviation, skewness, and Sharpe ratio; k-fold cross validation is used as the out-of-sample testing mechanism. The results indicate that the proposed naive heuristic rules exhibit strong out-of-sample performance, in most cases superior to the equal-weight naive strategy. These findings are consequential for at least two reasons: first, if these simple heuristic-based rules outperform the equal-weight naive strategy, then by transitivity they can outperform the mean–variance- and shortfall-optimal portfolio rules that have been shown in the literature to be inferior to the equal-weight naive rule, which further emphasizes the out-of-sample fragility of “optimal” methods; and second, among naive diversification strategies, some appear more robust in out-of-sample testing than others, hence the proposed methods may be useful when forming mixed portfolio selection models wherein a naive strategy is combined with an optimal strategy to improve performance.     

On <Emphasis Type=Italic>q</Emphasis>-optimal martingale measures in exponential Lévy models

We give a sufficient condition to identify the q-optimal signed and the q-optimal absolutely continuous martingale measures in exponential Lévy models. As a consequence, we find that in the one-dimensional case, the q-optimal equivalent martingale measures may exist only if the tails for upward jumps are extraordinarily light. Moreover, we derive the convergence of q-optimal signed, resp. absolutely continuous, martingale measures to the minimal entropy martingale measure as q approaches one. Finally, some implications for portfolio optimization are discussed. C.N. gratefully acknowledges financial support by UniCredit, Markets and Investment Banking. However, this paper does not reflect the opinion of UniCredit, Markets and Investment Banking, it is the personal view of the authors.     

Die Auswirkungen der Finanzkrise sowie von Solvency II auf <Emphasis Type=Italic>Insurance-linked Securities</Emphasis>

Der Beitrag stellt Insurance-linked Securities (“ILS”) als Instrument des alternativen Risikotransfers dar und grenzt ILS von anderen Instrumenten des alternativen Risikotransfers ab.     

A Proposal of an International Environmental Reporting Grid: What Interest for Policymakers,Regulatory Bodies,Companies, and Researchers?: Reply to Discussion of “Mandatory Environmental Disclosures by Companies Complying with IAS/IFRS: The Case of France,Germany and the UK”

This article offers the authors' insights concerning the issues raised by Professor Trevor Wilkins in commentaries on the article “Mandatory environmental disclosures by companies complying with IAS/IFRS: the case of France, Germany, and the UK” (Barbu et al., 2014). As suggested by Professor Wilkins, we demonstrate the utility of the international environmental reporting grid proposed in Barbu et al. (2014, Table 3): (1) for IASB policymakers and other regulatory bodies, (2) for companies to improve their environmental reporting, (3) for further research, and (4) for understanding the economic and financial consequences of IAS/IFRS-compliant environmental information.