Indice boursier | EPFL Graph Search

Un indice boursier représente le taux de croissance, entre deux dates, de la juste valeur d'un portefeuille théorique d'actions cotées sur les marchés organisés appartenant à une liste d'entreprises sélectionnée par des choix raisonnés. Généralités Un indice boursier désigne, quasiment toujours depuis la fin du , un nombre dont le taux de croissance, entre deux dates, est celui de la juste valeur d'un portefeuille théorique d'actions cotées sur les marchés organisés appartenant à une liste d'entreprises sélectionnée par des choix raisonnés. Cette liste est susceptible d'être remaniée au cours du temps par l'« homme de l'art » en utilisant cette même méthode non probabiliste à des dates dites « de révision de l'indice ». Tant que ce portefeuille n'est pas modifié, l'indice élémentaire de sa juste valeur à une date courante est également un indice synthétique des cours des titres qui le composent, susceptible d'être retenu pour résumer leur évolution relative d'ensemble de

Elliptical tempered stable distribution

Hasan Fallahgoul

Elliptical distributions are useful for modelling multivariate data, multivariate normal and Student t distributions being two special classes. In this paper, we provide a definition for the elliptical tempered stable (ETS) distribution based on its characteristic function, which involves a unique spectral measure. This definition provides a framework for creating a connection between the infinite divisible distribution (in particular the ETS distribution) with fractional calculus. In addition, a definition for the ETS copula is discussed. A simulation study shows the accuracy of this definition, in comparison to the normal copula for measuring the dependency of data. An empirical study of stock market index returns for 20 countries shows the usefulness of the theoretical results.

Routledge Journals, Taylor & Francis Ltd2016

Essays in Empirical Corporate Finance

Stefano Colonnello

This dissertation consists of three chapters. The first chapter examines whether the availability of credit default swaps (CDS) has consequences for creditor governance. CDSs offer creditors the opportunity to hedge credit risk and may impact their willingness to renegotiate debt agreements after covenant violations and to monitor firms. I show that firms implement more conservative investment and financing policies after covenant violations if CDSs are traded on their debt, consistent with heightened renegotiation frictions. Moreover, firms with traded CDS contracts exhibit significantly worse operating and stock performance after covenant violations. Overall, these findings point to an exacerbation of debt-equity conflicts due to the availability of CDSs. Finally, I analyze the interaction of creditor governance and internal governance, and provide evidence suggesting that the possibility to hedge risk through CDSs also reduces creditors' incentives to monitor firms. The second chapter models the joint effects of debt, macroeconomic conditions, and cash flow cyclicality on risk-shifting behavior and managerial pay-for-performance sensitivity. I show that risk-shifting incentives rise during recessions and that the shareholders can eliminate such adverse incentives by reducing the equity-based compensation in managerial contracts. I also show that this reduction should be larger in highly procyclical firms. Using a sample of U.S. public firms, I provide evidence supportive of the model's prediction. First, I find that equity-based incentives are reduced during recessions. Second, I show that the magnitude of this effect is increasing in a firm's cash flow cyclicality. The third chapter analyzes the impact of the formation of universal banks on corporate investment by looking at the gradual dismantling of the Glass-Steagall Act's separation between commercial and investment banking. Using a matched sample of U.S. firms and their relationship banks, I show that firms curtail investment after positive shocks to the underwriting capacity of their main bank. This result is driven by unrated firms and is strongest in the first two years after a shock. Moreover, I obtain similar results for borrowing firms' net debt issuance activity. As an exogenous shock to the formation of universal banks in the U.S., I also use the 1997 loosening of restrictions on commercial banks' securities activities. My findings suggest that universal banks may pay more attention to large and transparent firms that provide more underwriting opportunities while exacerbating financial constraints of opaque firms.

EPFL2015

Are green bonds priced lower than their conventional peers?

Yue Wu

The green bond market's rapid growth has alerted issuers and investors to this sustainable area of investment. This study ascertains whether green bonds are priced lower than conventional bonds-whether a negative green bond premium exists in both Chinese and global bond markets-and the driving forces behind any such green bond premium. First, an event study is set up to observe stock market's reaction upon issuance of green bonds to test whether green bonds are embedded with additional value by improving the issuer's equity market performance. Then, using the matching method and a two-layer regression process, the study estimates the green bond premium in the Chinese and global markets, respectively, and analyses factors affecting the green bond premium. The event study reveals that green bond issuance could reduce the issuer's equity return performance. The regression models found no significant negative green bond premium in either Chinese or global markets, indicating that green bonds are not priced significantly lower than conventional bonds. However, global market models show that issuing green bonds in CNY could reduce the green bond premium, unlike in USD or EUR.

ELSEVIER2022

Essays in Empirical Corporate Finance

Stefano Colonnello

EPFL2015