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Sökning: swepub > Umeå universitet > Puu Tönu 1936 > Tidskriftsartikel

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2.
  • Agliari, Anna, et al. (författare)
  • Global bifurcations of basins in a triopoly game
  • 2002
  • Ingår i: International Journal of Bifurcation and Chaos in Applied Sciences and Engineering. - 0218-1274. ; 12:10, s. 2175-2207
  • Tidskriftsartikel (refereegranskat)abstract
    • A Cournot model based on bounded inverse demand function and constant marginal production costs is studied. The case of three producers is considered and the adjustment process reduces to a three-dimensional noninvertible map in the output of competitors. The analysis of the dynamical behavior of the map is performed by the "critical curve method", extended to the critical surfaces in 3D. By this method, we explain the different bifurcations in the basins of attraction and in the attracting sets. In particular, given the economic application, feasible trajectories are focused, starting from the simple situation of two identical producers and extending the results to the generic case.
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3.
  • Agliari, Anna, et al. (författare)
  • The dynamics of a triopoly Cournot game
  • 2000
  • Ingår i: Chaos, Solitons & Fractals. - 0960-0779. ; 11:15, s. 2531-2560
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper reconsiders the Cournot oligopoly (noncooperative) game with iso-elastic demand and constant marginal costs, one of the rare cases where the reaction functions can be derived in closed form. It focuses the case of three competitors, and so also extends the critical line method for non-invertible maps to the study of critical surfaces in 3D. By this method the various bifurcations of the attractors and their basins are studied. As a special case the restriction of the map to an invariant plane when two of the three firms are identical is focused.
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4.
  • Canovas, Jose S, et al. (författare)
  • Detecting Chaos in a Duopoly Model via Symbolic Dynamics
  • 2010
  • Ingår i: Discrete and continuous dynamical systems. Series B. - Springfield, USA : American Institute of Mathematical Sciences. - 1531-3492. ; 13:2, s. 269-278
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper considers a Cournot duopoly model assuming isoelastic demand and smooth cost functions with built-in capacity limits. When the firms cannot obtain positive profits they are assumed to choose small "stand-by" outputs rather than closing down, in order to avoid substantial fitting up costs when market conditions turnout more favorable. It is shown that the model provides chaotic behavior. In particular, the system has positive topological entropy and hence the map is chaotic in the Li-Yorke sense. Moreover, chaos is not only topological but also physically observable.
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5.
  • Gallegati, Mauro, et al. (författare)
  • Hicks’ trade cycle revisited : cycles and bifurcations
  • 2003
  • Ingår i: Mathematics and Computers in Simulation. - 0378-4754. ; 63:6, s. 505-527
  • Tidskriftsartikel (refereegranskat)abstract
    • In the Trade Cycle, Hicks introduced the idea that endogenous fluctuations could be coupled with a growth process via nonlinear processes. To argue for this hypothesis, Hicks used a piecewise-linear model. This paper shows the need for a reinterpretation of Hicks’ contribution in the light of a more careful mathematical investigation. In particular, it will be shown that only one bound is needed to have non explosive outcome if the equilibrium point is an unstable focus. It will also be shown that when the fixed point is unstable the attracting set has a particular structure: It is a one-dimensional closed invariant curve, made up of a finite number of linear pieces, on which the dynamics are either periodic or quasi-periodic. The conditions under which the model produces periodic or quasi-periodic trajectories and the related bifurcations as a function of the main economic parameters are determined.
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6.
  • Panchuk, Anastasiia, et al. (författare)
  • Stability in a non-autonomous iterative system : An application to oligopoly
  • 2009
  • Ingår i: Computers and Mathematics with Applications. - Elsevier Ltd. - 0898-1221. ; 58:10, s. 2022-2034
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper reconsiders the relation between oligopoly and perfect competition, more specifically the problem of emergent instability when the number of competitors increases, as pointed out by several authors. A process of mixed short and long run dynamics is set up. In the short run the competitors are subject to capacity limits due to fixed capital stocks, in the long run they may renew these stocks and so in the moments of reinvestment have access to a constant returns technology. The evolution of the system depends on the number of competitors, the interval between their entry on the market, and the durability of capital. The main result is a theorem showing that if capital has a durability of more periods than the spacing of reinvestment times among the firms, multiplied with their total number, then the system always contracts to the Cournot equilibrium state.
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7.
  • Puu, Tönu, 1936-, et al. (författare)
  • A business cycle model with cubic nonlinearity
  • 2004
  • Ingår i: Chaos, Solitons & Fractals. - 0960-0779. ; 19:3, s. 597-612
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper deals with a simple multiplier-accelerator model of the business cycle, including a cubic nonlinearity. The corresponding two dimensional iterative map is represented in terms of its bifurcation diagram in parameter space. A number of bifurcation sequences for attractors and their basins are studied.
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9.
  • Puu, Tönu, 1936-, et al. (författare)
  • A Hicksian multiplier-accelerator model with floor determined by capital stock
  • 2005
  • Ingår i: Journal of Economic Behavior and Organization. - 0167-2681. ; 56:3, s. 331-348
  • Tidskriftsartikel (refereegranskat)abstract
    • This article reconsiders the Hicksian multiplier-accelerator model with the “floor” related to the depreciation on actual capital stock. Through the introduction of the capital variable, a growth trend is created endogenously by the model itself, along with growth rate oscillations around it. The “ceiling” can be dispensed with altogether. As everything is growing in such a model, a variable transformation is introduced to focus relative dynamics of the income growth rate and the actual capital output ratio.
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10.
  • Puu, Tönu, 1936- (författare)
  • A simplified model of spatiotemporal population dynamics.
  • 1985
  • Ingår i: Environment and planning A. - 0308-518X. ; 17:9, s. 263-269
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper is an extension of the model of population growth and migration originally developed by H. Hotelling in 1921. This model consists of two ingredients, a logistic growth function and a linear spatial diffusion term. The author notes that the saturation population can be affected by the development of new technology and that improvements in transportation have increased the possibilities for migration. "Basic nonlinearities are introduced by use of a production technology with increasing-decreasing returns to scale. It is demonstrated how industrial takeoffs, population transitions, and agglomerative spatial patterns can emerge by changing the model parameters.
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