1,721,041 research outputs found
Cristianesimo e politica II
No full textIl convegno ha prolungato il dibattito, già avviato con il precedente convegno Cristianesimo e politica I organizzato presso lo stesso Dipartimento di Storia Culture Religioni della Sapienza, sulla relazione strutturale tra religione e potere, sacro e profano, in particolare tra cristianesimo e politica, dal Nuovo Testamento alla contemporaneità. Gaetano Lettieri ha aperto il convegno; sono seguiti gli interventi di Raimondo Michetti e Francesco Scorza Barcellona. Philippe Blaudeau, dell'università di Angers, ha tenuto una relazione sul volume "Cesare e Dio. Potere spirituale e potere secolare in Occidente" di Marco Rizzi; Marco Rizzi dell'Università Cattolica di Milano/Brescia ha replicato e risposto agli interventi di colleghi e studenti. Paolo Bettiolo dell'Università di Padova ha tenuto una relazione sul volume "Il sacro e il potere. Il caso cristiano" di Giovanni Filoramo; Giovanni Filoramo dell'Università di Torino ha replicato e risposto agli interventi di colleghi e studenti
Variable Elasticity of Substitution in the Diamond Model: Dynamics and Comparisons
Full text linkWe study the dynamics shown by the discrete time Diamond overlapping generations model with the VES production function in the form given by Revankar[10] and compare our results with those obtained by Brianzoni et al.[2] in the Solow model.
We prove that, as in Brianzoni et al.[2], unbounded endogenous growth can emerge if the elasticity of substitution is greater than one; moreover, differently from Brianzoni et al.[2], the Diamond model can admit two positive steady states. We also prove that complex dynamics occur if the elasticity of substitution between production factors is less than one, confirming the results obtained by Brianzoni et al.[2]. Numerical simulations support the analysis
Non-compliant behaviour in public procurement: an evolutionary model with endogenous monitoring
Full text linkIn recent years, the study of the evolution of non-compliant behaviour in public procurement has been widely developed due to the growing economic relevance of this phenomenon. When such a question is formalized in terms of a dynamical model, new insights can be pursued, related to the possible evolution from a situation with low dishonesty level to high dishonesty level or vice versa. The present model considers an evolutionary adaptation process explaining whether honest or dishonest behaviour prevails in society at any given time by assuming endogenous monitoring by the State. We will distinguish between a scenario in which firms converge to monomorphic configurations (all honest or all dishonest) and a scenario in which firms converge to polymorphic compositions (that is with coexistence of both groups), depending on the relevant parameters. By making use of both analytical tools and numerical simulations, the present work aims at explaining the effectiveness of economic policies to reduce or eliminate non-compliant behaviour. Social stigma is found to play a key role: if the “inner attitude toward honesty” of a country is not strong enough, then dishonesty cannot be ruled out. However, increasing both the fine level attached to dishonest behaviour and the monitoring effort by the State can reduce asymptotic dishonesty levels and escape form the dishonesty trap
A dynamical model for real economy and finance
No full textWe have studied a discrete time dynamical model with four variables and delays, describing the interaction between a three-sector real economy and a financial market with four assets. Investors and financial intermediaries have heterogeneous beliefs. We show that complexity related to the evolution of state variables emerges and we investigate interdependence among economic fluctuations and assets volatility. By means of stability analysis we have found that real economy influences the existence of equilibrium prices in financial markets and that risky asset prices as well as capital per capita reach zero only when the elasticity of substitution between capital and labour is low enough. Bifurcation analysis shows that an increase of bond return would decrease the price of all the assets, conversely when the bond return decreases fluctuations and complex dynamics may arise. Due to the complexity of the model, computational tools are used to investigate long run dynamics, thus showing that for sufficiently high values of the interest rate bifurcations with repetitive structure emerge. In addition, we show how the total number of shares in each sector influences its price volatility. Finally, when fluctuations appear, economic policy intended to increase employment could stabilise the model only in sufficiently developed economies
The role of grandparents in grandchildren's education for human capital accumulation in an overlapping generations model
Full text linkWe develop an overlapping generations model to explore the role of grandparents in grandchildren's education and its impact on human capital growth. We examine the quantity-quality (Q-Q) trade-off faced by parents in choosing the number and education of children, incorporating an active role for grandparents. Findings underscore the significance of the elderly in human capital accumulation, fertility, and economic growth. When grandparents invest more time, resources are freed, fostering greater human capital growth and mitigating the effects of the Q-Q trade-off
A dynamically consistent discretization method for the Goodwin model with nonlinear Phillips curve. Comparing qualitative and quantitative dynamics
Full text linkThe Goodwin model is a widely used economic growth model able to explain endogenous fluctuations in employment rate andwage share; in its initial version, the standard
Phillips curve is used. In the present work, we suggest a revised Phillips curve that takes into account how the wage share influences the rate of changes of the wage itself thus obtaining a continuous-time modified Goodwin model. Since applying models to real data often requires working in a discrete-time setup, we then move from the continuous-time to the discrete-time version of the proposed model, by using a general polynomial discretization method in backward and forward-looking (hybrid discretization). By comparing the continuous-time system to its discrete-time counterpart we prove that fixed points and local dynamics do not change, as long as the
time step is not too high. Moreover, numerical simulations employing Dynamic Time Warping, cross-correlation, and semblance analysis consistently affirm that enhancing
the similarity of quantitative dynamics is achieved by reducing the time step
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