Inspection games with long-run inspectors

A single, long-run policeman faces a large population of myopic would- be criminals. This paper shows that this interaction has counterintuitive comparative static properties. A forward-looking inspector might tolerate more law violations than a short-sighted one.

Trust is bound to emerge (In the repeated Trust Game)

This paper addresses the emergence of cooperation in asymmetric pris- oners' dilemmas in which one player chooses after having observed the other player's choice (Trust Game). We use the finite automata approach with complexity costs to study the equilibria of the repeated version of this game. We show that there is a small set of automata that form the unique Closed Under Rational Behavior (CURB) set for this game. This set contains two non-strict Nash equilibria, a cooperative and a non- cooperative one. We show that the cooperative equilibrium is the only (cyclically) stable set under the so called Best Response Dynamics.

Tough Behavior in the Repeated Bargaining Game. A Computer Simulation Study.

Bargaining behavior occupies an important part in economics literature, or social sciences in general. Although there is an extensive simulation literature on social tradeoff in the Prisoner's Dilemma and the one-shot bargaining game, little has been done for the repeated bargaining game. Part of reason for this neglect is that, despite having a continuum of Nash equilibria, under homogeneous settings, the one shot bargaining game consistently gives a stable equilibrium of fairness (50-50 division), robust to many kind of tough perturbations. However, it's true that social interaction doesn't always yield unconditional egalitarianism. Hence we simulate a population of homogeneous agents playing the repeated bargaining game to test the stability of the 50-50 norm under evolutionary force. It turns out that when it comes to repeated interaction, the fair norm no longer stands strong

Diamond-inclusion system recording old deep lithosphere conditions at Udachnaya (Siberia)

Diamonds and their inclusions are unique fragments of deep Earth, which provide rare samples from inaccessible portions of our planet. Inclusion-free diamonds cannot provide information on depth of formation, which could be crucial to understand how the carbon cycle operated in the past. Inclusions in diamonds, which remain uncorrupted over geological times, may instead provide direct records of deep Earth’s evolution. Here, we applied elastic geothermobarometry to a diamond-magnesiochromite (mchr) host-inclusion pair from the Udachnaya kimberlite (Siberia, Russia), one of the most important sources of natural diamonds. By combining X-ray diffraction and Fourier-transform infrared spectroscopy data with a new elastic model, we obtained entrapment conditions, Ptrap = 6.5(2) GPa and Ttrap = 1125(32)–1140(33) °C, for the mchr inclusion. These conditions fall on a ca. 35 mW/m2 geotherm and are colder than the great majority of mantle xenoliths from similar depth in the same kimberlite. Our results indicate that cold cratonic conditions persisted for billions of years to at least 200 km in the local lithosphere. The composition of the mchr also indicates that at this depth the lithosphere was, at least locally, ultra-depleted at the time of diamond formation, as opposed to the melt-metasomatized, enriched composition of most xenoliths

Prescription appropriateness of anti-diabetes drugs in elderly patients hospitalized in a clinical setting: evidence from the REPOSI Register

Diabetes is an increasing global health burden with the highest prevalence (24.0%) observed in elderly people. Older diabetic adults have a greater risk of hospitalization and several geriatric syndromes than older nondiabetic adults. For these conditions, special care is required in prescribing therapies including anti- diabetes drugs. Aim of this study was to evaluate the appropriateness and the adherence to safety recommendations in the prescriptions of glucose-lowering drugs in hospitalized elderly patients with diabetes. Data for this cross-sectional study were obtained from the REgistro POliterapie-Società Italiana Medicina Interna (REPOSI) that collected clinical information on patients aged ≥ 65 years acutely admitted to Italian internal medicine and geriatric non-intensive care units (ICU) from 2010 up to 2019. Prescription appropriateness was assessed according to the 2019 AGS Beers Criteria and anti-diabetes drug data sheets.Among 5349 patients, 1624 (30.3%) had diagnosis of type 2 diabetes. At admission, 37.7% of diabetic patients received treatment with metformin, 37.3% insulin therapy, 16.4% sulfonylureas, and 11.4% glinides. Surprisingly, only 3.1% of diabetic patients were treated with new classes of anti- diabetes drugs. According to prescription criteria, at admission 15.4% of patients treated with metformin and 2.6% with sulfonylureas received inappropriately these treatments. At discharge, the inappropriateness of metformin therapy decreased (10.2%, P < 0.0001). According to Beers criteria, the inappropriate prescriptions of sulfonylureas raised to 29% both at admission and at discharge. This study shows a poor adherence to current guidelines on diabetes management in hospitalized elderly people with a high prevalence of inappropriate use of sulfonylureas according to the Beers criteria

Network externalities, critical masses and converters : an evolutionary analysis

Witt (1997) proposes a model of technological adoption in markets characterized by network externalities in which superior technological standards have smaller critical mass, so that they can easily displace inferior alternatives. This paper builds on his model to show that the critical mass of a given technology depends upon its e.ciency and its compatibility with the existing standard, and hence that more efficient technologies need not have smaller critical masses. Some consequences for the economics of converters and ”gateway technologies” are also discussed