The dynamics of social interaction with agents’ heterogeneity

We analyze a class of binary dynamic models inspired by [4] on agents’ choices and social interaction. The main feature of our analysis is that agents are heterogeneous, in particular their attitude to interact with the choices of the other agents changes over time endogenously. Although dynamic approaches to the study of models with heterogeneous agents have been already applied in different fields, to our knowledge a complete study of an endogenously varying population of agents has not yet been pursued. As observed in [3], the main problem is given by the fact that with heterogeneous agents the system may be non reversible. We address these problems, we describe the (possible multiple) steady states of the processes involved, we analyze local and global stability and we discuss the similarities and the differences with respect to the literature. Applications are also provided.heterogeneous agent models, intensity-based models, mean field interactions, random utilities, social interactions.

Identity, reputation and social interaction with an application to sequential voting

We analyze binary choices in a random utility model assuming that the agent's preferences are affected by conformism (with respect to the behavior of the society) and coherence (with respect to his identity). We apply the analysis to sequential voting when voters like to win.identity; reputation; social interaction; random utility models; voting system.

The Italian overnight market: microstructure effects, the martingale hypothesis and the payment system

This paper analyzes the Italian segment of the Eurozone money market since the start of the European Monetary Union. Some relevant variables are analyzed at different frequencies (intramonth, intraweek and intraday); both level and volatily of the overnight interest rate, volume exchanged in the Italian overnight market, domestic and cross-border large value payments channeled in the Italian real-time gross settlement system (BI-REL). Patterns against the martingale hypothesis on the short-term interest rate are detected, and the relationship between the payment flows and the rate itself is investigated. Overall, evidence comes out that in the new framework Italian banks seem to manage liquidity efficiently.overnight market, interest rate, payment system

The Comprehensive Assessment: What lessons can be learned?

Analysing the database made available by the European Central Bank and by the European Banking Authority, we evaluate the Comprehensive Assessment (CA) (Asset Quality Review and Stress Test (ST)) of banks carried out in 2014. In a nutshell, the main results are: (i) risk-adjusted capital ratios are negatively related to the Asset Quality Review shortfall, but not to the ST shortfall, whereas the leverage ratio plays a significant role in both cases; (ii) the CA predominantly concentrated on traditional credit activity rather than on banksâ\u80\u99 financial assets and (iii) the CA seems to be characterized by double standards. The Asset Quality Review was severe with banks operating in non-core countries, while medium-sized banks were either riskier or were treated severely in both exercises. The analysis leads to a puzzle: comparatively, the assessment per se led to significant adjustments for solid banks and large shortfalls for weak banks. The puzzle can be resolved by referring to the legacy of the countryâ\u80\u99s former supervisory activity and to the low level of capitalization of weak banks mostly in peripheral countries. Abbreviations: ADJ_AQR: adjustment due to the AQR; ADJ_ST: adjustment due to the ST adverse scenario; AQR: asset quality review; bps: basis points (1â\u80\u89bp is equal to 0.01%); bn: billion; CA: comprehensive assessment; CET1: common equity tier 1; CR: coverage ratio; CRD/CRR: capital requirements directive/capital requirements regulation; CVA: credit valuation adjustment; EBA: European Banking Authority; ECB: European Central Bank; LM test: Lagrange-multiplier test; NPE: Non-performing exposure; RWA: risk-weighted asset; SF_AQR: shortfall due to the AQR; SF_ST: shortfall due to the ST adverse scenario; SREP: supervisory review and evaluation process; SSM: single supervisory mechanism; ST: stress test; tr: trillion (one thousand of billions

The SSM at 1

On February 3-4, 2016 SUERF – The European Money and Finance Forum –, Deutsche Bundesbank and Stiftung Geld und Währung jointly organized a Colloquium/Conference in Frankfurt in order to evaluate the experience with the SSM – the Single Supervisory Mechanism – during the first year of its existence. The present issue of SUERF Conference Proceedings includes a selection of papers based on the authors’ contributions to the Frankfurt event