We show that both real indeterminacy and asset price bubble may appear in an infinite-horizon exchange economy with infinitely lived agents and an imperfect financial market. We clarify how the asset structure and heterogeneity (in terms of preferences and endowments) affect the existence and...

This paper aims at providing a simple economic framework to address the question of the optimal share of investments in medical R&D in total public spending. In order to capture the long-run impact of tax-financed medical R&D on the growth rate, we develop an endogenous growth model in the...

We consider an overlapping generations economy with altruism towards parents and a long-lived asset that delivers no dividends (pure bubble asset). We explore the role of ascendant altruism on the dynamics properties of equilibrium and rational bubbles in the cases of exogenous and endogenous...

We consider an overlapping generations model à la Diamond (1965) with two additional ingredients: altruism and an asset (or land) bringing non-stationary positive dividends (or fruits). We study the global dynamics of capital stocks and asset values as well as the interplay between them. Asset...

We build a dynamic general equilibrium model with heterogeneous producers and financial frictions (collateral constraints and incompleteness). First, we provide a characterization to check whether a sequence is an equilibrium or not. Second, we study the effects of financial imperfections on...

We extend the Lucas' 1988 model introducing two classes of agents with heterogeneous skills, discount factors and initial human capital endowments. We consider two regimes according to the planner's political constraints. In the first regime, that we call meritocracy, the planner faces...

In a simple infinite-horizon exchange economy with a single consumption good and a financial asset, real indeterminacy and asset price bubble may arise. We show how heterogeneity (in terms of preferences, endowments) and short-sale constraints affect the emergence and the dynamics of asset price...

We consider a simple discrete-time version of Lucas (1988). When the speed of human capital accumulation is high (low), the Balanced Growth (Degrowth) Path is the unique optimal solution.