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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Decisions in economics and finance 16 (1993), S. 39-58 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract We study a non-linear model of the interactions between stock market prices and the level of assets owned by investment funds. The model dynamics is described, in continuous time, by a smooth vector field in the plane, which presents, under suitable hypotheses, a unique equilibrium point. Our analisis of the system flow is qualitative and focuses on detecting endogenous fluctuations of the state variables, i.e. on checking existence and number of limit cycles. We prove that several, and quite different, dynamical patterns can occur, even in cases where the system isoclines assume that “most simple” geometrical forms. It is shown, in particular, that the equilibrium point can undergo either a sub-critical or a super-critical Hopf-bifurcation whenever two economically meaningful exogenous parameters are made to cross a given set of critical values. Hence, in the subcritical case, as a trapping region exists, at least two limit cycles appear. Next, we give analytical examples of model-consistent vector fields which present a multiplicity of fluctuating trends, and prove the apparently surprising result that the number of limit cycles can be as large as one wants, provided a specific isocline assumes a “cubic” shape.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Decisions in economics and finance 8 (1985), S. 123-140 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Riassunto Il lavoro estende un modello macroeconomico dell'economia irregolare che è stato proposto da B. Contini, F. Cugno e M. Galeotti nel 1984. Come nello schema originario la dimensione di ciascun settore economico (quello regolare e quello irregolare) dipende dall'andamento dei costi ad esso relativi, mentre il tasso di inflazione è legato ai prezzi ed alle quote dei due diversi settori. Noi non trattiamo, tuttavia, il differenziale tra i tassi di crescita della produttività,k, come una grandezza costante, e scriviamo, invece, una nuova equazione differenziale che ne descrive la dinamica. In questo modo si ottiene uno spazio delle fasi di dimensione tre che è stratificato da varietà invarianti di dimensione due. Ciascuna di queste varietà contiene esattamente un punto di equilibrio, che si prova essere un attrattore globale, sotto opportune condizioni al bordo. Dimostriamo, infine, che nell'ambito del nostro modello è formalemente possibile controllare il settore irregolare; questo ci porta al problema economico di quali politiche centrali siano atte a far conseguire un obbiettivo fissato relativamente alla dimensione della attività regolari ed irregolari in cui si articola il sistema.
    Notes: Abstract The macroeconomic model of an irregular economy proposed by B. Contini, F. Cugno and M. Galeotti (1984) is extended by increasing the number of state variables and thus the dimension of the phase space for the relative dynamical system. By showing, through standard Liapunov methods, the non existence of closed non trivial orbits, the global attractivity of the equilibrium set is proved, under suitable boundary conditions. Control policies leading the economy to a desired equilibrium state are seen to be feasible, and ≪central≫ instruments which appear to be effective in this respect are briefly discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Decisions in economics and finance 5 (1982), S. 3-14 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Abstract The first part of this paper, section 2, is devoted to a short description of a pure exchange economy model where commercial operations are carried out by using one of the existingn+1 goods as money The market situation thereby discussed bears many features of a monetary economy as drafted by R. W. Clower in his 1967 paper. It mantains anyway two basic restrictions: (a) the nature of money as commodity-money, (no fiatmoney is envisaged); and (b) the temporary isolation of the exchange process, (we discuss in fact a market in which each agent behaves as if there were no past or future). The convergence and stability problem is studied following the not-deterministic, non-tatonnement approach proposed by S. Smale and D. Friedman. An auctioneer calls prices at each instant, and transactions are mediated by a particular good utilized as a means of exchange. Agents are requested to be “utilities' improvers” and transfer of goods can take place under disequilibrium conditions by means of some rationing mechanism. In the second part of the paper, section 3 and 4, an extension of the original model is proposed where the good acting as money is desired not only for its physical characteristics, but also for its “institutional” form. We show that this kind of “preference for liquidity” leads on the one hand to a natural extension of the analytical results, (convergence of the economical process can still be proved), on the other hand it introduces a set of accessible points in the state-space which properly contains the original set of market equilibria. This result suggests a few observations, section 5, regarding the appearance of a “store of value” effect for any commodity utilized as a means of exchange as far as agents' demand takes into account its institutional role.
    Notes: Abstract In questa nota si propone una estensione del modello dinamico di economia monetaria di puro scambio sviluppato da D. Friedman in un lavoro recente [5]. Lo schema analitico mantiene il carattere non deterministico e non tâtonnement introdotto da S. Smale nello studio di processi transattivi [9]. Ammettendo che la merce usata nel sistema come moneta sia richiesta dagli agenti non solo sulla base delle sue caratteristiche fisiche, ma anche a partire dal ruolo istituzionale assolto, si prova che il processo economico converge ad una varietà di configurazioni finali che è strettamente più ampia dell'insieme degli equilibri walrasiani.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Annali di matematica pura ed applicata 161 (1992), S. 299-313 
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We study autonomous systems in the plane of polynomial type. We obtain conditions for the existence of unbounded trajectories of such systems. As a consequence we prove that it does not exist a planar polynomial system of even degree with a global center.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Annali di matematica pura ed applicata 171 (1996), S. 83-105 
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The artiche extends and proves a Conjecture of R. Conti. Let be a plane polynomial vector field, its Poincaré compactification, π the central projection of the sphere S2 on the plane T tangent at the north pole. If $$\tilde \Gamma $$ is a monodromic polycycle (cyclic separatrix) of , intersecting but not coinciding with the equator S1, $$\Gamma = \pi (\tilde \Gamma )$$ is said a monodromic unbounded polycycle (m.u.p.). Conti's Conjecture can be so rephrased: If Γ is a m.u.p. and deg , then Γ has at most n−1 connected components. The proof is in two steps: Theorem 3.1 and Theorem 4.1. The main technique utilized is that of iterated directional blow-ups (σ-process) of the singular points at infinity of (i.e. the singularities of on S1).
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2007-08-01
    Print ISSN: 0016-0032
    Electronic ISSN: 1879-2693
    Topics: Mathematics , Technology
    Published by Elsevier
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  • 7
    Publication Date: 2009-12-01
    Print ISSN: 0362-546X
    Electronic ISSN: 1873-5215
    Topics: Mathematics
    Published by Elsevier
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  • 8
    Publication Date: 2018-05-01
    Print ISSN: 1054-1500
    Electronic ISSN: 1089-7682
    Topics: Physics
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  • 9
    Publication Date: 2007-01-01
    Description: The main objective of the paper is to analyze the effects on economic agents' behavior deriving from the introduction of financial activities aimed to environmental protection. The environmental protection mechanism we study should permit exchange of financial activities among citizens, firms, and Public Administration. Such a particular “financial market” is regulated by the Public Administration, but mainly fuelled by the interest of two classes of involved agents: firms and dwelling citizens. We assume that the adoption process of financial decisions is described by a two-population evolutionary game and we study the basic features of the resulting dynamics.
    Print ISSN: 1110-757X
    Electronic ISSN: 1687-0042
    Topics: Mathematics
    Published by Hindawi
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  • 10
    Publication Date: 2020-08-01
    Print ISSN: 0377-2217
    Electronic ISSN: 1872-6860
    Topics: Mathematics , Economics
    Published by Elsevier
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