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Neuroeconomics: the Neurobiology of Decision-Making
Neuroeconomics: The Neurobiology of Decision-Making Ifat Levy Section of Comparative Medicine Department of Neurobiology Interdepartmental Neuroscience Program Yale School of Medicine Harnessing eHealth and Behavioral Economics for HIV Prevention and Treatment April 2012 Overview • Introduction to neuroeconomics • Decision under uncertainty – Brain and behavior – Adolescent behavior – Medical decisions Overview • Introduction to neuroeconomics • Decision under uncertainty – Brain and behavior – Adolescent behavior – Medical decisions Neuroeconomics NeuroscienceNeuronal MentalPsychology states “asEconomics if” models architecture Abstraction Neuroeconomics Behavioral Economics Neuroscience Psychology Economics Abstraction Neuroscience functional MRI VISUAL STIMULUS functional MRI: Blood Oxygenation Level Dependent signals Neural Changes in oxygen Change in activity consumption, blood flow concentration of and blood volume deoxyhemoglobin Change in Signal from each measured point in space at signal each point in time t = 1 t = 2 t = 3 t = 4 t = 5 t = 6 dorsal anterior posterior lateral ventral dorsal anterior medial posterior ventral Anterior The cortex Cingulate Cortex (ACC) Medial Prefrontal Cortex (MPFC) Posterior Cingulate Cortex (PCC) Ventromedial Prefrontal Cortex (vMPFC) Orbitofrontal Cortex (OFC) Sub-cortical structures fMRI signal • Spatial resolution: ~3x3x3mm3 Low • Temporal resolution: ~1-2s Low • Number of voxels: ~150,000 High • Typical signal change: 0.2%-2% Low • Typical noise: more than the signal… High But… • Intact human -
Doralzuelan: an Emerging Identity of the Venezuelan Immigrant in Southern Florida
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by ASU Digital Repository Doralzuelan: An Emerging Identity of the Venezuelan Immigrant in Southern Florida by Blanca Romero Pino A Thesis Presented in Partial Fulfillment of the Requirements for the Degree Master of Arts Approved June 2018 by the Graduate Supervisory Committee: Karen Adams, Chair Matthew Prior Doris Warriner ARIZONA STATE UNIVERSITY August 2018 ABSTRACT The steady influx of Venezuelan immigrants to the United States has resulted in the creation of a close-knit community of these immigrants in the city of Doral, Florida, now nicknamed Doralzuela given the strong imprint Venezuelan have left in this city. This study aimed at gaining understanding on how the process of immigration and settlement in the context has affected Venezuelan immigrants’ identity, their perception and use of English and Spanish in daily interactions, and how, or if, their bonds with the home country has affected their incorporation to the host society. The study followed a qualitative design. Eight semi-structured interviews were conducted and analyzed following Riessman’s (2008) notion of dialogic narrative analysis. Six themes emerged from the data; (re)configuration of the self, the role of social networks, negotiating identity through language, issues of assimilation, transnational identity, and Doralzuela, the new Venezuela. These themes were discussed, and multiple and distinct views on each theme were identified. i DEDICATION To my family, for giving me their unconditional love To Shea, for being my rock To Venezuela, for being my source of inspiration ii ACKNOWLEDGMENTS I owe my eternal gratitude to so many people who have helped me, not on the completion of this thesis, but throughout my entire master’s program. -
History-Dependent Risk Attitude
Available online at www.sciencedirect.com ScienceDirect Journal of Economic Theory 157 (2015) 445–477 www.elsevier.com/locate/jet History-dependent risk attitude ∗ David Dillenberger a, , Kareen Rozen b,1 a Department of Economics, University of Pennsylvania, 160 McNeil Building, 3718 Locust Walk, Philadelphia, PA 19104-6297, United States b Department of Economics and the Cowles Foundation for Research in Economics, Yale University, 30 Hillhouse Avenue, New Haven, CT 06511, United States Received 21 June 2014; final version received 17 January 2015; accepted 24 January 2015 Available online 29 January 2015 Abstract We propose a model of history-dependent risk attitude, allowing a decision maker’s risk attitude to be affected by his history of disappointments and elations. The decision maker recursively evaluates compound risks, classifying realizations as disappointing or elating using a threshold rule. We establish equivalence between the model and two cognitive biases: risk attitudes are reinforced by experiences (one is more risk averse after disappointment than after elation) and there is a primacy effect (early outcomes have the greatest impact on risk attitude). In a dynamic asset pricing problem, the model yields volatile, path-dependent prices. © 2015 Elsevier Inc. All rights reserved. JEL classification: D03; D81; D91 Keywords: History-dependent risk attitude; Reinforcement effect; Primacy effect; Dynamic reference dependence * Corresponding author. E-mail addresses: [email protected] (D. Dillenberger), [email protected] (K. Rozen). 1 Rozen thanks the NSF for generous financial support through grant SES-0919955, and the economics departments of Columbia and NYU for their hospitality. http://dx.doi.org/10.1016/j.jet.2015.01.020 0022-0531/© 2015 Elsevier Inc. -
A Measure of Risk Tolerance Based on Economic Theory
A Measure Of Risk Tolerance Based On Economic Theory Sherman D. Hanna1, Michael S. Gutter 2 and Jessie X. Fan3 Self-reported risk tolerance is a measurement of an individual's willingness to accept risk, making it a valuable tool for financial planners and researchers alike. Prior subjective risk tolerance measures have lacked a rigorous connection to economic theory. This study presents an improved measurement of subjective risk tolerance based on economic theory and discusses its link to relative risk aversion. Results from a web-based survey are presented and compared with results from previous studies using other risk tolerance measurements. The new measure allows for a wider possible range of risk tolerance to be obtained, with important implications for short-term investing. Key words: Risk tolerance, Risk aversion, Economic model Malkiel (1996, p. 401) suggested that the risk an to describe some preliminary patterns of risk tolerance investor should be willing to take or tolerate is related to based on the measure. The results suggest that there is the househ old situation, lifecycle stage, and subjective a wide variation of risk tolerance in people, but no factors. Risk tolerance is commonly used by financial systematic patterns related to gender or age have been planners, and is discussed in financial planning found. textbooks. For instance, Mittra (1995, p. 396) discussed the idea that risk tolerance measurement is usually not Literature Review precise. Most tests use a subjective measure of both There are at least four methods of measuring risk emotional and financial ability of an investor to tolerance: askin g about investment choices, asking a withstand losses. -
Ni Los Bachaqueros Tienen Pasta, Insecticidas Y Desodorantes BA RC E LO N a La Escasez De Productos Se Acentúa Cada Vez Más, Al Lavaplatos
PREMIO NACIONAL DE PERIODISMO 1982 / 1989 / 1990 3 4° Puerto La Cruz, Vi e r n e s 9 de oc tubre de 201 5 Año LVI N° 21 .457 w w w.e l t i e m p o.co m .ve EL PERIÓDICO DEL PUEBLO ORIENTAL PV Justo Bs 40,00 Fecha de Marcaje 08/15 VP asegura que esa tolda propondrá Miss Venezuela 2015 a la persona que sustituirá a Carlos Este jueves se celebró el magno evento de la belleza nacional donde Mariam Habach, representante del estado Vecchio como candidato para la AN PÁG. 7 Lara, se convirtió en la nueva soberana PÁG. 13 PREGUNTA DE LA SEMANA: ¿Está de acuerdo con el plan de racionamiento que aplica Corpoelec? Vote en w w w.eltiempo.com.ve ECONOMÍA // CONSUMIDORES ASEGURAN QUE SE HAN VISTO EN LA NECESIDAD DE COMPRAR CON SOBREPR EC I O Ni los bachaqueros tienen pasta, insecticidas y desodorantes BA RC E LO N A La escasez de productos se acentúa cada vez más, al lavaplatos. Rosa Quintero, una de las comerciantes informales P re p a ra n extremo de que ni con los revendedores del mercado municipal del centro de expendio porteño, aseguró que también se o rd e n a n z a de Puerto La Cruz se pueden conseguir varios artículos, entre encuentran casi desaparecidas las fórmulas lácteas para bebés, para adecuar ellos, sprays contra insectos, antitranspirantes, espaguettis y el papel higiénico, las toallas sanitarias y la mostaza PÁG. 2 espacio por BTR PÁG. 3 ZONA CENTRO O b re ro s de taladros protest aron en Anaco PÁG. -
Utility with Decreasing Risk Aversion
144 UTILITY WITH DECREASING RISK AVERSION GARY G. VENTER Abstract Utility theory is discussed as a basis for premium calculation. Desirable features of utility functions are enumerated, including decreasing absolute risk aversion. Examples are given of functions meeting this requirement. Calculating premiums for simplified risk situations is advanced as a step towards selecting a specific utility function. An example of a more typical portfolio pricing problem is included. “The large rattling dice exhilarate me as torrents borne on a precipice flowing in a desert. To the winning player they are tipped with honey, slaying hirri in return by taking away the gambler’s all. Giving serious attention to my advice, play not with dice: pursue agriculture: delight in wealth so acquired.” KAVASHA Rig Veda X.3:5 Avoidance of risk situations has been regarded as prudent throughout history, but individuals with a preference for risk are also known. For many decision makers, the value of different potential levels of wealth is apparently not strictly proportional to the wealth level itself. A mathematical device to treat this is the utility function, which assigns a value to each wealth level. Thus, a 50-50 chance at double or nothing on your wealth level may or may not be felt equivalent to maintaining your present level; however, a 50-50 chance at nothing or the value of wealth that would double your utility (if such a value existed) would be equivalent to maintaining the present level, assuming that the utility of zero wealth is zero. This is more or less by definition, as the utility function is set up to make such comparisons possible. -
Loss Aversion in Decisions Under Risk and the Value of a Symmetric Simplification of Prospect Theory
1 Loss Aversion in Decisions under Risk and the Value of a Symmetric Simplification of Prospect Theory By Eyal Ert and Ido Erev Max Wertheimer Minerva Center for Cognitive Studies, Technion, Israel Abstract Three studies are presented that examine alternative interpretations of the loss aversion assertion (Kahneman and Tversky (1979)). The first two studies reject a "strong" interpretation: In violations of this interpretation the choice rate of the risky option was higher given prospects with mixed payoffs (gain and losses) than given prospects with nonnegative payoffs. The third study rejects a "moderate" interpretation of loss aversion: It shows that the elimination of the loss aversion assumption from prospect theory increases the theory's predictive value. The results demonstrate the value of a simplified version of prospect theory that assumes a symmetric value function (with diminishing sensitivity relative to the reference point), a symmetric probability weighting function (that implies a certainty/possibility effect) and a stochastic response rule. Keywords: Stochastic models, Cumulative prospect theory, Predictive value. JEL Classification: C91, D01. 2 1. INTRODUCTION The loss aversion assertion, one of the assumptions that underlie prospect theory (Kahneman and Tversky (1979)), implies that losses loom larger than gains. That is, the absolute subjective value of a specific loss is larger than the absolute subjective value of an equivalent gain. This assertion was shown to provide an elegantexplanation to a wide set of important behavioral phenomena. Famous examples are the endowment effect (Kahneman, Knetsch and Thaler (1990)), the status quo bias (Samuelson and Zeckhauser (1988)), and the equity premium puzzle (Benartzi and Thaler (1995)). -
Risk Aversion and Emotions
bs_bs_banner Pacific Economic Review, 19: 3 (2014) pp. 296–312 doi: 10.1111/1468-0106.12067 RISK AVERSION AND EMOTIONS YEN NGUYEN Tilburg University CHARLES N. NOUSSAIR* Tilburg University Abstract. We consider the relationship between emotions and decision-making under risk. Specifi- cally, we examine the emotional correlates of risk-averse decisions. In our experiment, individuals’ facial expressions are monitored with face reading software, as they are presented with risky lotteries. We then correlate these facial expressions with subsequent decisions in risky choice tasks. We find that a more positive emotional state is positively correlated with greater risk taking. The strength of a number of emotions, including fear, happiness, anger and surprise, is positively correlated with risk aversion. JEL Classification Code: C9 1. INTRODUCTION The mechanisms that underpin choice under risk have been a primary focus of research in economics, psychology and neuroscience. The traditional approach in economics has been to postulate the existence of a utility function, possessing the expected utility property, that represents an individual’s preferences, and to note that concavity implies a preference for relatively safe lotteries, while convexity corresponds to a preference for relatively risky lotteries. Neuroscien- tists have documented the physiological correlates of risky decision-making. Psychologists and behavioural economists stress the role of emotions such as happiness or fear in guiding individuals’ choices in risky situations (see e.g. Forgas, 1995; Loewenstein and Lerner, 2003; Coget et al., 2011). The focus of the work reported here is to better understand the connection between emotions, which are ultimately psychological terms describing profiles of physiological responses, and the level of risk aversion exhibited in financial decision-making tasks. -
Aragüeños: No Tenemos Agua Ni Para Calmar La Sed
PREMIO NACIONAL DE PERIODISMO 1982 / 1989 / 1990 33° El Tigre - Anaco, J u eve s 8 de oc tubre de 201 5 Año LVI Edición 3.456 w w w.e l t i e m p o.co m .ve EL PERIÓDICO DEL PUEBLO ORIENTAL PV Justo Bs 40,00 Fecha de Marcaje 08/15 Fapuv pidió a defensor del Pueblo Sube tensión en Medio Oriente intervenir como mediador en disputa La jefa de la diplomacia europea, Federica Mogherini, alertó ayer sobre el “riesgo real”de que haya una nueva escalada de violencia salarial del sector universitario PÁG. 7 en Israel y Palestina, tras los choques de los últimos días PÁG. 10 PREGUNTA DE LA SEMANA: ¿Está de acuerdo con el plan de racionamiento que aplica Corpoelec? Vote en w w w.eltiempo.com.ve DÉFICIT // ALCALDÍA SÓLO CUENTA CON UNA CISTERNA PARA ABASTECER A LOCALIDADES POPULARES Aragüeños: no tenemos agua ni para calmar la sed Habitantes del sector La Vuelta del Caro, en el municipio agua potable en la comunidad. La vecina Vilmaria Vargas Aragua, zona centro de Anzoátegui, cerraron ayer por cuatro afirmó que 200 familias se estaban surtiendo de una laguna, horas -entre 5:00 y 9:00 am- la vía que los comunica con pero se está secando. En Los Coloraditos y Boquerón también Barcelona y Anaco. ¿La razón? Llevan dos meses sin recibir trancaron la carretera por la falta del recurso PÁG. 4 POLÍTIC A Istúriz exhortó a salir a la calle a buscar votos para el 6D PÁG. 3 ECO N O M Í A Fetranzoáte gui: mayoría recibe sueldo de sólo 1,24 dólares al día PÁG. -
Monetary Policy, Redistribution, and Risk Premia∗
Monetary Policy, Redistribution, and Risk Premia∗ Rohan Kekrey Moritz Lenelz September 2019 Abstract We study the transmission of monetary policy through risk premia in a heteroge- neous agent New Keynesian environment. Heterogeneity in agents' marginal propensity to take risk (MPR) summarizes differences in risk aversion, constraints, rules of thumb, background risk, and beliefs relevant for portfolio choice on the margin. An unexpected reduction in the nominal interest rate redistributes to agents with high MPRs, lower- ing risk premia and amplifying the stimulus to the real economy through investment. Quantitatively, this mechanism rationalizes the empirical finding that the stock market response to monetary policy shocks is driven by news about future excess returns. JEL codes: E44, E63, G12 ∗We thank Adrien Auclert, Markus Brunnermeier, Emmanuel Farhi, Zhiguo He, Anil Kashyap, Gita Gopinath, Francois Gourio, Veronica Guerrieri, Erik Hurst, Nobu Kiyotaki, Stefan Nagel, Brent Neiman, Monika Piazzesi, Martin Schneider, Alp Simsek, Ludwig Straub, Gianluca Violante, Ivan Werning, Tom Winberry, and Moto Yogo for discussions. yUniversity of Chicago Booth School of Business. Email: [email protected]. zPrinceton University. Email: [email protected]. 1 Introduction In the data, expansionary monetary policy lowers risk premia. This finding has been es- tablished for the equity premium in stock markets, the term premium on longer maturity nominal bonds, and the external finance premium on risky corporate debt.1 The basic New Keynesian framework as described by Woodford (2003) and Gali (2008) does not capture this aspect of monetary policy transmission. As noted by Kaplan and Violante (2018), this is equally true for an emerging body of heterogeneous agent New Keynesian models whose focus on heterogeneous marginal propensities to consume has substantially enriched the im- plications for aggregate consumption but less so for asset prices and therefore investment. -
Using Lotteries to Finance Public Goods: Theory ∗ and Experimental Evidence
INTERNATIONAL ECONOMIC REVIEW Vol. 48, No. 3, August 2007 USING LOTTERIES TO FINANCE PUBLIC GOODS: THEORY ∗ AND EXPERIMENTAL EVIDENCE BY ANDREAS LANGE,JOHN A. LIST, AND MICHAEL K. PRICE1 University of Maryland and ZEW; University of Chicago and NBER; and University of Nevada, Reno This study explores the economics of charitable fund-raising. We begin by de- veloping theory that examines the optimal lottery design while explicitly relaxing both risk-neutrality and preference homogeneity assumptions. We test our theory using a battery of experimental treatments and find that our theoretical predic- tions are largely confirmed. Specifically, we find that single- and multiple-prize lotteries dominate the voluntary contribution mechanism both in total dollars raised and the number of contributors attracted. Moreover, we find that the op- timal fund-raising mechanism depends critically on the risk postures of potential contributors and preference heterogeneity. 1. INTRODUCTION A rich literature has developed in the past several decades that systematically examines the supply side of public goods provisioning. Leaders in the field have grappled with the importance of altruism, fairness, reciprocity, inequity aversion, and the like in explaining the behavior of agents in such environments.2 Yet as Andreoni (1998) aptly points out, the demand side of charitable fund-raising re- mains largely unexplored and many critical issues remain unresolved. One line of research that has begun to fill these gaps is the exploration of charitable lot- teries as a means to finance public goods. In an important study, Morgan (2000) shows that lotteries obtain higher levels of public goods provision than a vol- untary contributions mechanism because the lottery rules introduce additional private benefits from contributing. -
Individual Risk Aversion Through the Life Cycle
Individual Risk Aversion Through the Life Cycle: Incorporation of Observed Measures of Individual Risk Aversion in the Estimation of Dynamic Life Cycle Decision Models∗ Marcela Parada-Contzeny April 6, 2017 Abstract I develop a dynamic model of individual lifetime behavior and jointly estimate a set of correlated dynamic equations for observed risk aversion, wealth-related decisions (employ- ment, occupation, investment, and savings), and other characteristics that an individual may value independently of wealth (family and health). I consider how to incorporate observed measures of individual risk aversion (calculated from survey responses) into an empirical model of individual behavior and how to reconcile the use of these measures with the economic theory of individual behavior over time. I allow risk preferences to be an endogenous determinant of observed behaviors and find that there is correlation, through unobserved characteristics, between risk aversion and wealth-related behaviors, as well as causal effect of risk preferences on these outcomes. The joint estimation of observed risk aversion and behaviors reduces the bias on the estimated marginal effects of endogenous variables that impact wealth-related decisions and better approximate the distribution of individual unobserved heterogeneity. Risk aversion provides explanatory power, yet require using econometric methods that account for correlated unobservables. Failure to model this correlation may result in biased estimates and overestimation of policy effects. Keywords: Risk