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Modelling a dynamic market potential: A class of automata networks for diffusion of innovations 总被引:1,自引:0,他引:1
Renato Guseo Author Vitae Mariangela Guidolin Author Vitae 《Technological Forecasting and Social Change》2009,76(6):806-667
Innovation diffusion processes are generally described at aggregate level with models like the Bass Model (BM) and the Generalized Bass Model (GBM). However, the recognized importance of communication channels between agents has recently suggested the use of agent-based models, like Cellular Automata. We argue that an adoption or purchase process is nested in a communication network that evolves dynamically and indirectly generates a latent non-constant market potential affecting the adoption phase.Using Cellular Automata we propose a two-stage model of an innovation diffusion process. First we describe a communication network, an Automata Network, necessary for the “awareness” of an innovation. Then, we model a nested process depicting the proper purchase dynamics. Through a mean field approximation we propose a continuous representation of the discrete time equations derived by our nested two-stage model. This constitutes a special non-autonomous Riccati equation, not yet described in well-known international catalogues. The main results refer to the closed form solution that includes a general dynamic market potential and to the corresponding statistical analysis for identification and inference. We discuss an application to the diffusion of a new pharmaceutical drug. 相似文献
94.
Helder Ferreira de Mendonça Renato Falci Villela Loures 《Journal of Regulatory Economics》2009,36(3):286-307
Market discipline is a regulatory mechanism which has as its main task the punishment of bad risk management by financial
institutions. Subordinated debt holders are considered by the literature as the most propitious private agent to discipline
the financial institutions. The key to prove the existence of market discipline is to show the relationship between banks’
asset prices and its respective risks. The main objective of this article is an empirical analysis of the relation between
credit risk (ratings and accounting information) and debentures return for the Brazilian case. The results denote a weak presence
of market discipline in Brazil. 相似文献
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Three hypotheses on services, the Gershuny effect, the externalisation of producers services and the macroeconomic equation for the services share in employment, are tested with Brazilian data. The first two show trends similar to those in the developed economies, but, in the last one, findings are affected by consideration of the underground economy. The results suggest a dual character for Brazilian services: an informal, labour intensive group of sectors, present in the large metropolitan areas, coexists with a formal, less labour intensive one, where producers' services are probably predominant. These groups will respond differently to a greater trade liberalisation. 相似文献
97.
Modern Rice Technologies and Productivity in the Philippines: Disentangling Technology from Managerial Gaps 总被引:1,自引:0,他引:1 下载免费PDF全文
Renato Villano Boris Bravo‐Ureta Daniel Solís Euan Fleming 《Journal of Agricultural Economics》2015,66(1):129-154
Using cross‐sectional farm‐level data from 3,164 rice‐farming households in the Philippines, we measure the impact of modern rice technologies on farm productivity while disentangling technology gaps (the distance between production frontiers) from managerial gaps (differences in technical efficiency). To do so, we combine a recently developed stochastic production frontier framework with impact evaluation techniques to control for biases stemming from observables and unobservables. First, we find an adequate control group using propensity score matching to mitigate the effect of biases from observable variables. Then, we test for biases that might arise from unobserved variables using a stochastic frontier framework corrected for self‐selection. Finally, we estimate meta‐frontiers to assess productivity differences between adopters and non‐adopters. The analysis shows that the adoption of certified seeds has a significant and positive impact on productivity, efficiency and net income in rice farming. 相似文献
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Vietnam’s higher education has witnessed substantial improvements since the implementation of the Doi Moi (renovation) policy. One of the significant developments is the promotion of establishment and enhancement of the role of private institutions in national education systems. However, the quest to improve the overall performance of the private higher education institutions remains a big challenge for many stakeholders. We assess the performance of Vietnamese private universities using a data envelopment analysis–based bootstrap directional distance approach with quasi-fixed inputs. The results show that there was a large variation in the efficiency levels of private universities within and between academic years and between metropolitan and other private universities. Our empirical findings provide more insights for educational leaders and policy makers on the performance of private higher education institutions and the implications of privatization of the national higher education system. 相似文献
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Portuguese Economic Journal - We show that in finite settings with identical firms and consumers, asymmetric pure price equilibria with positive profits exist. We consider a price competition... 相似文献