This paper analyzes the equilibrium dynamics of an AK-type endogenous growth model with vingage capital. The inclusion of vintage capital leads to oscillatory dynamics governed by replacement echoes, which additionally influence the intercept of the balanced growth path. These features, which...

Differential equations with advanced and delayed time arguments may arise in the optimality conditions of simple growth models with delays. Models with investment gestation lags (time-to-build), consumption gestation lags (habit formation) or learning by using lie in this category. In this...

La caida sostenida del precio de los bienes de equipo, relativo al de los bienes de consumo, se interpreta como unamanifestación de progreso técnico incorporado (PTI). En este artículo revisaremos la metodología de la medición del crecimiento y veremos que la presencia de PTI nos obliga a...

In this paper we analyze the role of replacement and innovation activity in shaping investment behavior and labor productivity in a panel of Spanish manufacturing firms from 1990 to 2001. Investment is concentrated about large investment episodes, or investment spikes, whose nature varies by...

Why is R&D spending so low in Spanish firms? One possible answer may lie in a small contribution of innovative investments to value creation at the firm level. When pulling together complementary sources of spending data and related evidence to measure these investments, we observe that R&D is...

Economists model time as continuous or discrete. The recent literature on continuous time models with delays should help to bridge the gap between these two families of models. In this note, we propose a simple time--to--build model in continuous time, and show that a discrete time version is a...

In an optimal growth model with a time-to-build delay, the feasibility condition is a delayed-differential equation, and the Euler-type condition is an advanced-differential equation. As in Kalecki's theory of business cycles, the delayed nature of the feasibility constraint naturally induces...

This paper analyzes the equilibrium dynamics of and optimal growth model that incorporates endogenous depreciation, variable capital utilization, and expenditures on the maintenance of physical capital. Maintenance acts as a substitute for investment, since it reduces the depreciation of...

This paper examines how a scrappage subsidy affects the lifetime of durable goods when secondhand markets are present. To this end, we propose a vintage model to analyze the replacement decision in an economy in which high and low income agents trade on a durable good. Thus, the existence of a...