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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 13 (1990), S. 111-131 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Riassunto Si considera una versione modificata del modello di crescita non-lineare di Goodwin, in cui il reddito,Y, è una funzione quadratica dello stock di capitale,k, così da permettere la possibilità di rendimenti crescenti o decrescenti. La dinamica del modello viene allora rappresentata da un sistema non autonomo di due equazioni differenziali. Con l'ipotesi che l'offerta di lavoro,N, e la produttività,a, siano costanti nel tempo, il modello diventa autonomo e può essere immerso in una famiglia stabile di sistemi dinamici piani, di cui vengono descritti i flussi globali e le biforcazioni.
    Notes: Abstract We consider a modified version of Goodwin's celebrated non-linear model of fluctuating growth, where the incomeY is a quadratic function of the capital stockk, in order to take into account the possibility of increasing or decreasing returns. The dynamics of the model is then defined by a non-autonomous system of two differential equations. Assuming the labour supply,N, and the productivity,a, to be constant in the time, the model becomes autonomous and can be embedded in a stable family of planar dynamical systems whose flows and bifurcations are globally described
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Decisions in economics and finance 13 (1990), S. 133-145 
    ISSN: 1129-6569
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Riassunto Un modello non-lineare di crescita alla Goodwin, in cui i rendimenti possono essere non costanti, è rappresentato da un sistema dinamico piano non autonomo, che può essere trasformato in un sistema autonomo tridimensionale. Viene descritto il comportamento globale di quest'ultimo nei due casi di rendimenti crescenti o decrescenti. Si dimostra, in particolare, l'assenza di attrattori economicamente significativi ed il diverso carattere delle orbite: mentre, se i rendimenti sono crescenti, le traiettorie convergono asintoticamente ad un punto singolare dove “l'economia muore”, nel caso opposto le traiettorie sono illimitate e spiraleggiano intomo ad una retta che ha la direzione dell'assek (la variabile di stato che rappresenta lo stock di capitale).
    Notes: Abstract The dynamics of a model of fluctuating growth, where non-constant returns are allowed, is represented, under Goodwin's classical assumptions, by a non-autonomous two-dimensional system, which can be transformed into an autonomous three-dimensional one. We describe the global phase portrait of the latter, in the two cases of increasing and decreasing returns, proving, in particular, the absence of economically meaningful “attractors”. However the orbits exhibit different features in the two cases: namely they asymptotically converge to a singular point, where “the economy dies”, if the returns are decreasing, and diverge, spiralling around a certain line, if the returns are increasing.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1991-03-01
    Print ISSN: 0008-0624
    Electronic ISSN: 1126-5434
    Topics: Mathematics
    Published by Springer
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  • 5
    Publication Date: 1994-10-01
    Print ISSN: 1435-9529
    Electronic ISSN: 1435-9537
    Topics: Geosciences
    Published by Springer
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