Time Variation in an Optimal Asymmetric Preference Monetary Policy Model

This paper considers a time varying parameter extension of the Ruge-Murcia (2003, 2004) model to explore whether some of the variation in parameter estimates seen in the literature could arise from this source. A time varying value for the unemployment volatility parameter can be motivated through several means including variation in the slope of the Phillips curve or variation in the preferences of the monetary authority.We show that allowing time variation for the coefficient on the unemployment volatility parameter improves the model fit and it helps to provide an explanation of inflation bias based on asymmetric central banker preferences, which is consistent across subsamples.

Measuring the influence of customer-based store brand equity in the purchase intention

[EN] Store brands account for and important market share in the Spain and a further increase in expected in the next years due to the downturn. However, there is lack of research on store brand customer-based Brand Equity. This study attempts to propose an integrated model of Brand Equity in store or retailer brands, based on Aaker s well-known conceptual model. We propose a consumer-based model, including the main sources or dimensions of Brand Equity and considering the intention to purchase as a consequence. Based on a sample of 362 consumers and 5 store brands, structural equation modeling is used to test research hypotheses. The results obtained reveal that store brand awareness, loyalty along with store brand perceived quality have a significant influence on consumers intention to purchase store brands. Our study suggests that marketers and marketing managers from retailing companies should carefully consider the Brand Equity components when designing their brand strategies, and develop marketing activities in order to enhance their brands awareness.

Self-Organized Criticality, Plasticity and Sensorimotor Coupling. Explorations with a Neurorobotic Model in a Behavioural Preference Task

During the last two decades, analysis of 1/f noise in cognitive science has led to a considerable progress in the way we understand the organization of our mental life. However, there is still a lack of specific models providing explanations of how 1/f noise is generated in coupled brain-body-environment systems, since existing models and experiments typically target either externally observable behaviour or isolated neuronal systems but do not address the interplay between neuronal mechanisms and sensorimotor dynamics. We present a conceptual model of a minimal neurorobotic agent solving a behavioural task that makes it possible to relate mechanistic (neurodynamic) and behavioural levels of description. The model consists of a simulated robot controlled by a network of Kuramoto oscillators with homeostatic plasticity and the ability to develop behavioural preferences mediated by sensorimotor patterns. With only three oscillators, this simple model displays self-organized criticality in the form of robust 1/f noise and a wide multifractal spectrum. We show that the emergence of self-organized criticality and 1/f noise in our model is the result of three simultaneous conditions: a) non-linear interaction dynamics capable of generating stable collective patterns, b) internal plastic mechanisms modulating the sensorimotor flows, and c) strong sensorimotor coupling with the environment that induces transient metastable neurodynamic regimes. We carry out a number of experiments to show that both synaptic plasticity and strong sensorimotor coupling play a necessary role, as constituents of self-organized criticality, in the generation of 1/f noise. The experiments also shown to be useful to test the robustness of 1/f scaling comparing the results of different techniques. We finally discuss the role of conceptual models as mediators between nomothetic and mechanistic models and how they can inform future experimental research where self-organized critically includes sensorimotor coupling among the essential interaction-dominant process giving rise to 1/f noise.

Customer Engagement kontzeptuaren barnerapena C2C merkataritza elektronikoan

[EU] Hurrengo lana, Consumer to Consumer merkataritza elektronikoan (hemendik aurrera, C2C) fokatuta dagoen azterketa da. C2C merkatu elektronikoaren esparruan kontsumitzaileak erosketa burutzera bultzatzen duten faktoreak identifikatu nahi dira. Horretarako, lehendabizi C2C merkataritza elektronikoaren ingurunea aztertuko da gainetik, gaia kokatzeko asmotan. Ingurune honetan artikulu zientifikoetan, gero eta nabarmentasun handiagoa hartzen ari den Customer Engagement edo kontsumitzailearen konpromisoa kontzeptuaren azterketa bat burutuko da. Kontzeptu hau hobeto ulertzeko asmotan, autore desberdinek eskainitako definizioak eta beste definizio baliagarri batzuk aurkituko ditugu. Behin kontzeptua definiturik, honek barneratzen duen zikloa identifikatzera pasatuko gara. Horretarako, Sashik 2012 urtean argitaratutako ikerketa lana hartu da oinarri lez. Autore honek egindako zikloari, ekarpen propio gisa, kontsumitzaileen jarrera ulertzen lagunduko diguten beste hainbat kontzeptu gehitu dira. Azkenik, aipatutako eta aztertutako kontzeptuak errealitatean identifikatzeko, azterketa praktiko bat burutu da. Azterketa honetan, teorian azaldutakoa, adibide errealen bidez identifikatzeaz gain, inkesta txiki bat aurkituko dugu. Honen bitartez, lan teorikoari erabilera praktikoago bat eman nahi izan zaio.