EXPRESS: Extremity Bias in Online Reviews: The Role of Attrition

In a range of studies across platforms, online ratings have been shown to be characterized by distributions with disproportionately-heavy tails. We focus on understanding the underlying process that yields such “j-shaped” or “extreme” distributions. We propose a novel theoretical mechanism behind the emergence of “j-shaped” distributions: differential attrition, or the idea that potential reviewers with moderate experiences are more likely to leave the pool of active reviewers than potential reviewers with extreme experiences. We present an analytical model that integrates this mechanism with two extant mechanisms: differential utility and base rates. We show that while all three mechanisms can give rise to extreme distributions, only the utility-based and the attrition-based mechanisms can explain our empirical observation from a large-scale field experiment that an unincentivized solicitation email from an online travel platform reduces review extremity. Subsequent analyses provide clear empirical evidence for the existence of both differential attrition and differential utility.

Self-Similar Functional Circuit Models of Arteries and Deterministic Fractal Operators: Theoretical Revelation for Biomimetic Materials

In this paper, the self-similar functional circuit models of arteries are proposed for bioinspired hemodynamic materials design. Based on the mechanical-electrical analogous method, the circuit model can be utilized to mimic the blood flow of arteries. The theoretical mechanism to quantitatively simulate realistic blood flow is developed by establishing a fractal circuit network with an infinite number of electrical components. We have found that the fractal admittance operator obtained from the minimum repeating unit of the fractal circuit can simply and directly determine the blood-flow regulation mechanism. Furthermore, according to the operator algebra, the fractal admittance operator on the aorta can be represented by Gaussian-type convolution kernel function. Similarly, the arteriolar operator can be described by Bessel-type function. Moreover, by the self-similar assembly pattern of the proposed model, biomimetic materials which contain self-similar circuits can be designed to mimic physiological or pathological states of blood flow. Studies show that the self-similar functional circuit model can efficiently describe the blood flow and provide an available and convenient structural theoretical revelation for the preparation of in vitro hemodynamic bionic materials.

Electrodeposition of Nanostructured Chromium Conglomerates from Cr(III) Dissolved in a Deep Eutectic Solvent: Influence of Forced Convection

Cr electrodeposition onto glassy carbon rotating disk electrode (GCRDE) was studied from Cr(III) dissolved in the choline chloride and ethylene glycol eutectic mixture (ethaline) under different GCRDE angular speeds, ω, at 343 K. The ethaline kinematic viscosity, ν= 0.17〖 cm〗^2 s^(-1), was estimated, for the first time, from potentiodynamic plots. Analisys of potentiostatic current density transients, j-t plots, recorded at different ω, was based on the Hyde et al. (J. Electroanal. Chem. 534 (2002) 13) model, jdc-fcon(t), complemented by a previous adsorption step, jad(t), and the residual water reduction, jWR(t), taking place on the growing surfaces of the Cr nuclei. Nucleation frequency and number density of active sites showed small dependence on ω; however, jWR(t) clearly depends on it. SEM, EDS and XPS techniques were used to characterize the Cr electrodeposited. Electrodeposits were formed by quasi-spherical conglomerates (ca. 50 and 200 nm diameter for 0 and 1500 rpm, respectively) of nanoparticles (sized less than 30 nm diameter, in both cases). Moreover, these electrodeposits were formed by chromium and oxygen and its content increases with ω. These nanoparticles exhibit a core-shell structure: Cr(0)@ Cr(OH)3@ Cr2O3 which is consistent with the theoretical mechanism used for the analysis of the j-t plots

Requirements for mammalian promoters to decode transcription factor dynamics

In response to different stimuli many transcription factors (TFs) display different activation dynamics that trigger the expression of specific sets of target genes, suggesting that promoters have a way to decode them. Combining optogenetics, deep learning-based image analysis and mathematical modeling, we find that decoding of TF dynamics occurs only when the coupling between TF binding and transcription pre-initiation complex formation is inefficient and that the ability of a promoter to decode TF dynamics gets amplified by inefficient translation initiation. Furthermore, we propose a theoretical mechanism based on phase separation that would allow a promoter to be activated better by pulsatile than sustained TF signals. These results provide an understanding on how TF dynamics are decoded in mammalian cells, which is important to develop optimal strategies to counteract disease conditions, and suggest ways to achieve multiplexing in synthetic pathways.

Demand Shocks and Firm Investment: Micro-evidence from fiscal retrenchment in Italy

We study the effect of a persistent demand shock on corporate factor utilization. Our identification strategy leverages a legislative change designed to permanently reduce spending in certain targeted municipalities. This change generates an arguably-exogenous drop in the revenue of procurement firms, which differs depending on each firm’s reliance for its revenue on procurement in the targeted municipalities. We find that firms responded to the demand shock by cutting capital rather than labor. We propose a theoretical mechanism based on the irreversibility of capital investment.

Informal Customary Institutions, Collective Action, and Submunicipal Public Goods Provision in Mexico

ABSTRACT This article explores the role of informal customary institutions (usos y costumbres) in local public goods provision in Mexico. It argues that the presence of informal customary institutions offers submunicipal village communities considerable advantages in local distributive politics. Hamlet communities with dense customary institutions have higher collective action capacity to organize their citizens for small-scale protests in municipal centers, which grants them access to more social infrastructure projects controlled by municipal politicians. This article therefore suggests a novel theoretical mechanism through which customary institutions affect development outcomes: collective contentious action. The study tests the main empirical implications of this theory, drawing on an original survey of submunicipal community presidents in the states of Puebla and Tlaxcala and qualitative interviews.

A Recipe for Success: The Effect of Dyadic Communication and Cooperative Gameplay on Subsequent Non-gaming Task Performance

Cooperative game play has been associated with a growing list of prosocial benefits. However, less research has examined its constituent parts to determine their contribution to subsequent positive outcomes. The current study examined partners’ communication as a common and even imperative aspect of cooperative play that may largely account for its positive effects on cooperative behaviors and effective teamwork. Partners played a cooperative game (Overcooked 2) alone or with a partner, and in the latter case with or without the ability to communicate, before engaging in two puzzle-solving tasks that required effective and efficient communication for successful performances. Results suggest communication is unnecessary, and may even be detrimental to, subsequent team performances on non-gaming tasks, and that it seems unlikely to account for the cooperative norms proposed to be the theoretical mechanism behind cooperative play’s positive effects. The conclusion discusses theoretical implications and potential future research.

EXPRESS: Why Salespeople Avoid Big-Whale Sales Opportunities

Contrary to the intuition that salespeople gravitate toward big-whale sales opportunities, in reality they often avoid them. To study this phenomenon, the authors integrate contingent decision-making and conservation-of-resources theories to develop and test a framework of salespeople's decision making when prospecting. Study 1 reveals that the performance impact of salesperson initial judgment of opportunity magnitude follows an inverted U shape, indicating that salespeople's avoidance of large opportunities results from rational benefit–cost analyses due to their conservation of resources. Interestingly, salespeople use a calibration decision-making strategy (i.e., calculating expected benefits by accounting for conversion uncertainty) at the portfolio rather than prospect level, in solution- but not product-selling contexts. Ignoring this calibration effect can lead to under- or overestimation of conversion rates of up to 100%. Study 2 shows that salespeople's past performance success and experience bias this calibration. Simulations reveal that when high performers or inexperienced salespeople believe their portfolio magnitude is large and conversion uncertainty low, they are less concerned about resource conservation and improve their quota attainment by 50%. Study 3 confirms the theoretical mechanism. These findings shed new lights on salespeople's decision making and suggest ways for sales professionals to improve effectiveness when prospecting.

The Economic Origins of Authoritarian Values: Evidence From Local Trade Shocks in the United Kingdom

What explains the backlash against the liberal international order? Are its causes economic or cultural? We argue that while cultural values are central to understanding the backlash, those values are, in part, endogenous and shaped by long-run economic change. Using an original survey of the British population, we show that individuals living in regions where the local labor market was more substantially affected by imports from China have significantly more authoritarian values and that this relationship is driven by the effect of economic change on authoritarian aggression. This result is consistent with a frustration-aggression mechanism by which large economic shocks hinder individuals’ expected attainment of their goals. This study provides a theoretical mechanism that helps to account for the opinions and behaviors of Leave voters in the 2016 UK referendum who in seeking the authoritarian values of order and conformity desired to reduce immigration and “take back control” of policymaking.