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Cultural evolution: The case of babies’ first names
Xi, Ning; Zhang, Zi-Ke; Zhang, Yi-Cheng; Ge, Zehui; She, Li - In: Physica A: Statistical Mechanics and its Applications 406 (2014) C, pp. 139-144
In social sciences, there is currently rare consensus on the underlying mechanism for cultural evolution, partially due to lack of suitable data. The evolution of first names of newborn babies offers a remarkable example for such researches. In this paper, we employ the historical data on baby...
Persistent link: https://www.econbiz.de/10010871954
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Cooperative networks overcoming defectors by social influence
Gomez Portillo, Ignacio - In: Physica A: Statistical Mechanics and its Applications 394 (2014) C, pp. 198-210
We address the cooperation problem in structured populations by considering the prisoner’s dilemma game as a metaphor of the social interactions between individuals with imitation capacity. We present a new strategy update rule called democratic weighted update where the individual’s...
Persistent link: https://www.econbiz.de/10010873822
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Social influence promotes cooperation in the public goods game
Wu, Te; Fu, Feng; Dou, Puxuan; Wang, Long - In: Physica A: Statistical Mechanics and its Applications 413 (2014) C, pp. 86-93
Previous studies mainly consider the random selection pattern in which individuals randomly choose reference models from their neighbors for strategy updating. However, the random selection pattern is unable to capture all real world circumstances. We institute a spatial model to investigate the...
Persistent link: https://www.econbiz.de/10010906950
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The existence of negative absolute temperatures in Axelrod’s social influence model
Villegas-Febres, J.C.; Olivares-Rivas, W. - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 14, pp. 3701-3707
We introduce the concept of temperature as an order parameter in the standard Axelrod’s social influence model. It is defined as the relation between suitably defined entropy and energy functions, T=(∂S/∂E)−1. We show that at the critical point, where the order/disorder transition...
Persistent link: https://www.econbiz.de/10011059238
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Social influence and the Matthew mechanism: The case of an artificial cultural market
Bask, Miia; Bask, Mikael - In: Physica A: Statistical Mechanics and its Applications 412 (2014) C, pp. 113-119
We show that the Matthew effect, or Matthew mechanism, was present in the artificial cultural market Music Lab in one-fourth of the “worlds” when social influence between individuals was allowed, whereas this effect was not present in the “world” that disallowed social influence between...
Persistent link: https://www.econbiz.de/10011062049
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A novel opinion dynamics model based on expanded observation ranges and individuals’ social influences in social networks
Diao, Su-Meng; Liu, Yun; Zeng, Qing-An; Luo, Gui-Xun; … - In: Physica A: Statistical Mechanics and its Applications 415 (2014) C, pp. 220-228
In this paper, we propose an opinion dynamics model in order to investigate opinion evolution and interactions and the behavior of individuals. By introducing social influence and its feedback mechanism, the proposed model can highlight the heterogeneity of individuals and reproduce realistic...
Persistent link: https://www.econbiz.de/10010939932
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Insolvency and contagion in the Brazilian interbank market
Souza, Sergio R.S.; Tabak, Benjamin M.; Silva, Thiago C.; … - In: Physica A: Statistical Mechanics and its Applications 431 (2015) C, pp. 140-151
This paper proposes a new way to model and analyze contagion in interbank networks. We use a unique dataset from the … Brazilian financial system and include all active financial intermediaries. We show that the contagion chain has a short … propagation path. We find that first-round contagion is generated only by banks and that medium-sized banks can generate contagion …
Persistent link: https://www.econbiz.de/10011264556
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Why is no financial crisis a dress rehearsal for the next? Exploring contagious heterogeneities across major Asian stock markets
Dewandaru, Ginanjar; Masih, Rumi; Masih, A. Mansur M. - In: Physica A: Statistical Mechanics and its Applications 419 (2015) C, pp. 241-259
Our study attempts to discover pure contagion or interdependence amongst the Asian equity markets (China, India, Taiwan …–lag relationship. We find that most of the earlier shocks were transmitted via excessive linkages or pure contagion, while the recent … subprime crisis appears to have resulted mostly in fundamentals-based contagion or interdependence. This assertion is based …
Persistent link: https://www.econbiz.de/10011117813
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Credit risk enhancement in a network of interdependent firms
Neu, Peter; Kühn, Reimer - In: Physica A: Statistical Mechanics and its Applications 342 (2004) 3, pp. 639-655
We generalize existing structural models for credit risk to capture the impact of counterparty defaults on economic capital allocated to banks’ loan portfolios. Exploring the analogy to a lattice gas model from physics, correlations between sequential defaults are modeled as due to...
Persistent link: https://www.econbiz.de/10011062925
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The spatial Probit model—An application to the study of banking crises at the end of the 1990’s
Amaral, Andrea; Abreu, Margarida; Mendes, Victor - In: Physica A: Statistical Mechanics and its Applications 415 (2014) C, pp. 251-260
We use a spatial Probit model to study the effect of contagion between banking systems of different countries. Applied … to the late 1990s banking crisis in Asia we show that the phenomena of contagion is better seized using a spatial than a … effects of contagion that result from the outbreak of one initial crisis in one country or system. These contagion effects may …
Persistent link: https://www.econbiz.de/10011063569