We test a q investment model for Belgium using a multivariate cointegration approach. The introduction of the degree of capacity utilization duc, in addition to investment and average q, is necessary to determine the cointegration space. This supports the idea that marginal q differs from...

We consider an overlapping generations model with uncertain lifetime and endogenous growth. Individuals have to choose the length of time devoted to schooling before starting to work. We show that it depends positively on life expectancy but that the positive effect of a longer life on growth...

In a competitive overlapping generation model, underutilization of labor and equipment can be due to the combinaison of irreversibility of human capital, physical capital and technology with idiosyncratic productivity shocks. Irreversibilities and uncertainty generate an inefficient allocation...

In an unionized OLG model, it is shown that steady-state underutilization of labour and equipment can be due to the combinaison of the following elements : (i) Irreversibility of capital, technology and skill decision, (ii) Firm specific shocks on productivity. The presence of unions is neither...

We study how economic growth is affected by demographics in an overlapping generations model with a realistic survival law. Individuals optimally chose the dates at which they leave school to enter the labor market and at which they retire. Endogenous growth arises thanks to the accumulation of...

This paper evaluates the relevance of q theories under stochastic demand and capacity constraints by estimating an investment function for the Belgian economy. Under these theoretical conditions, we find that the investment rate depends on average q and on the expectations about the degree of...