BEGIN:VCALENDAR VERSION:2.0 PRODID:-//AMSE//Event Calendar//FR CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT UID:event-8798@amse-aixmarseille.fr DTSTAMP:20260416T152202Z CREATED:20260416T152202Z LAST-MODIFIED:20260416T152202Z STATUS:CONFIRMED SEQUENCE:0 SUMMARY:phd seminar - Rosnel Sessinou*\, Anna Zaytseva** DTSTART:20220118T100000Z DTEND:20220118T113000Z DESCRIPTION:*I show that if predictable factors drive stock returns\, they admit a vector autoregressive (VAR) representation. I establish an equivale nce between the predictability of financial markets and an increase in unce rtainty and systemic risk on the markets. Modularity is introduced as a mea sure of uncertainty and systemic risk. Unlike the existing measures of unce rtainty\, it is easier to calculate for any financial market and produces m arket-specific information. I establish that an increase in uncertainty or systemic risk leads to a collapse of the (trust) linkages between firms lis ted on financial markets. This result is related to the theory of reputatio n and fragility of financial markets. I prove that a financial crisis is no t due to an increase in the linkages between financial firms but to an incr ease in uncertainty on the market\, unlike what financial market regulators assume. I present the implications for the regulation of financial markets . I also show that the modularity of non-financial firms and mid-cap firms can warn one year in advance about the explosion of financial bubbles. Thes e results are valid across Global\, US\, European and French markets over 2 005-2020. However\, the estimation of modularity requires estimating a high -dimensional VAR model. For this reason\, I introduce a general framework f or estimation and inference in high-dimensional linear regression models wi th stationary data. **This paper analyzes how the effect of low general pr actitioners’ density on quality of primary care is mediated by enrollment in integrated practices.We use two independent cross-sectional surveys (20 19-2020) of 1\,209 French private practice general practitioners (GPs) repr esentative of those practicing in France (except Mayotte) in terms of gende r\, age\, workload and GP density of the practice location.We assumed that low GP density influences their wellbeing as well as their use of e-health tools and ultimately the (1) quantity of care approximated by a latent vari able comprising GPs’ declared practices regarding patient care management and (2) quality of care approximated by a latent variable comprising frequ encies of vaccine recommendations. Moreover\, we consider an enrollment in an integrated practice (so-called multi-professional group practice) as an additional mediator between GP density and the quality of care.Our results suggest that the relation between low GP density and quantity of care deliv ered within their practice in the absence of potential mediators was negati ve and significant\; there was no significant effect on vaccine recommendat ions. In the presence of mediators\, low GP density was significantly and n egatively associated with GPs’ wellbeing\, that was consecutively associa ted with inferior patient care management. Conversely\, there was a positiv e and significant correlation between low GP density and an enrollment in a n integrated practice\, mediated by the use of e-health tools which was in turn associated with greater involvement in vaccine recommendations.\\n\\nC ontact: Kenza Elass : kenza.elass[at]univ-amu.frCamille Hainnaux : camille. hainnaux[at]univ-amu.frDaniela Horta Saenz : daniela.horta-saenz[at]univ-am u.frJade Ponsard : jade.ponsard[at]univ-amu.fr\n\nPlus d'informations: http s://amse-aixmarseille.fr/fr/evenements/rosnel-sessinou-anna-zaytseva URL;VALUE=URI:https://amse-aixmarseille.fr/fr/evenements/rosnel-sessinou-anna-zaytseva CONTACT:Kenza Elass : kenza.elass[at]univ-amu.frCamille Hainnaux : camille. hainnaux[at]univ-amu.frDaniela Horta Saenz : daniela.horta-saenz[at]univ-am u.frJade Ponsard : jade.ponsard[at]univ-amu.fr TRANSP:OPAQUE END:VEVENT END:VCALENDAR