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1.
Summary. We study a one-sector stochastic optimal growth model with a representative agent. Utility is logarithmic and the production function is of the Cobb-Douglas form with capital exponent
. Production is affected by a multiplicative shock taking one of two values with positive probabilities p and 1-p. It is well known that for this economy, optimal paths converge to a unique steady state, which is an invariant distribution. We are concerned with properties of this distribution. By using the theory of Iterated Function Systems, we are able to characterize such a distribution in terms of singularity versus absolute continuity as parameters
and p change. We establish mutual singularity of the invariant distributions as p varies between 0 and 1 whenever
. More delicate is the case
. Singularity with respect to Lebesgue measure also appears for values
such that
. For
and
Peres and Solomyak (1998) have shown that the distribution is a.e. absolutely continuous. Characterization of the invariant distribution in the remaining cases is still an open question. The entire analysis is summarized through a bifurcation diagram, drawn in terms of pairs
.Received: 9 April 2002, Revised: 29 October 2002, JEL Classification Numbers:
C61, O41.Correspondence to: Tapan MitraThis research was partially supported by CNR (Italy) under the "Short-term mobility" program and by M.U.R.S.T. (Italy) National Group on "Nonlinear Dynamics and Stochastic Models in Economics and Finance" . We are indebted to Rabi Bhattacharya for providing us with the reference to Solomyak's (1995) paper. The present version has benefitted from comments by Mukul Majumdar and two anonymous referees. 相似文献
2.
This paper attempts to combine the political economics models on separation of powers between the legislature and the executive with public choice theories on the behavior of the judicial branch. We obtain a model of political accountability and checks and balances with up to three government branches: the executive, the legislature and the judiciary. We conclude that an independent judiciary improves the political accountability of democratic systems relative to the political economics models with two government branches. An accommodating judiciary, however, changes the distribution of political rents without improving accountability. 相似文献
3.
Fabio D'Orlando 《Atlantic Economic Journal》1996,24(1):83-93
The collection of essays edited by Giovanni Caravale has the explicit aim of letting the reader know the principal positions
that have characterized the long-lasting debate in the themes of Marxian economics. In particular, the book is concerned with
the contributions of those authors who recognize the relevance of Piero Sraffa's analysis for the interpretation of Marxian
economic thought, showing that, even among these authors, opinions on the topic are deeply different. The book consists of
two volumes: the first one, "Values, Prices and Exploitation," deals with the main theme of Marxian value theory, while the
second, "The Future of Capitalism and the History of Thought," deals with discussion of the law of the falling rate of profit
and of the role of Marx's theory in the history of economic thought. 相似文献
4.
Economists often operate under an implicit assumption that the tastes of a decision maker are quite stable, while his beliefs change with the availability of new information. We show that for a general class of preferences, a separation of a key component of tastes, the utility function, from the other components of the representation is possible only if the decision maker's preferences satisfy a mild but not completely innocuous condition, called ‘certainty independence’. We also outline the axiomatic characterization of the preferences that obtain such separation, which are a subset of the biseparable preferences. 相似文献
5.
Fabio Privileggi 《Decisions in Economics and Finance》1995,18(2):165-180
A notion of finitely optimal plan for intertemporal optimization problems as a necessary condition for optimality is introduced. Under interiority of a feasible plan and differentiability of the return function, such a plan satisfies the stochastic analogue of deterministicEuler-Lagrange conditions, which become also sufficient conditions under concavity of the return function. Then, under more general assumptions, a sufficient criterion of optimality based on competitive plans supported by price systems and transversality conditions is discussed. Differently from the current literature, no restrictive hypotheses on the probability measure of the random shocks are assumed.
Sommario Nella prima parte del lavoro si studiano le soluzioni dettefinitamente ottime che costituiscono una condizione necessaria per l'ottimalità di un piano ammissibile . Sotto ipotesi di interiorità del piano ammissibile e di differenziabilità della funzione obiettivo uniperiodaleF, vengono formulate le condizioni necessarie diEuler-Lagrange in ambito stocastico; aggiungendo l'ulteriore ipotesi di concavità perF, tali condizioni diventano anche sufficienti per l'ottimalità finita.La teoria viene poi estesa al caso sopradifferenziabile ottenendo una generalizzazione delle condizioni di Euler-Lagrange stocastiche che consente di individuare i piani finitamente ottimi mediante la nozione dicompetitività, ovvero supportabilità di un sistema di prezzi aleatori. Con una condizione di trasversalità all'infinito, la competitività diventa condizione sufficiente anche per l'ottimalità propria (cioè non solo finita).La peculiarità della presente trattazione è che tali condizioni sono formulate sotto ipotesi molto generali per quanto riguarda il processo degli shocks esogeni.相似文献
6.
Fabio Canova Filippo Ferroni Christian Matthes 《Journal of Applied Econometrics》2014,29(7):1099-1117
We propose two methods to choose the variables to be used in the estimation of the structural parameters of a singular DSGE model. The first selects the vector of observables that optimizes parameter identification; the second selects the vector that minimizes the informational discrepancy between the singular and non‐singular model. An application to a standard model is discussed and the estimation properties of different setups compared. Practical suggestions for applied researchers are provided. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
7.
Fabio Boncinelli Francesca Gerini Gabriele Pagnotta Frode Alfnes 《International Journal of Consumer Studies》2017,41(1):46-53
Unhealthy food choice is one of the main causes of being overweight. Nutritionists blame a particular category of food: junk food. Several authors have proposed a fat tax for reducing the junk food demand, but others have demonstrated that these taxes must be very high in order to be effective. Therefore, a warning label about calorie content may be an alternative way to reduce the consumption of junk food. In this exploratory study, using students as respondents, a high‐calorie warning label is explored with an incentive compatible valuation method. The results indicate that a high‐calorie warning label has little effect on respondents’ choices, even when they have no prior familiarity with the food. 相似文献
8.
This paper uses a two-country, flexible-price model with overlapping generations of infinitely lived households to study the role of net foreign asset dynamics in the propagation of productivity shocks. Absence of Ricardian equivalence ensures existence of a unique steady-state level of net foreign assets, to which the economy returns following temporary shocks. Model dynamics are significantly different from those of a setup in which terms of trade movements perform all the international adjustment and net foreign assets do not move. The difference relative to a complete markets economy in which net foreign asset movements play no role in shock transmission is smaller. It is amplified if the substitutability across goods rises and if shocks are permanent. 相似文献
9.
10.