This article deals with the problem of decomposing a time series into a sum of unobserved components as in seasonal adjustment or in trend-cycle decompositions. In particular, we analyze the case where model-based decompositions as performed by the so-called Structural Time Series models and by...

This paper discusses the application of the EM algorithm for maximum likelihood estimation of factor models with conditional heteroskedasticity in the common factors.

It is well known from time series analysis that shocks to aggregate output have very persistent effects. This paper argues that the relation between the expected growth rate of a firm and its size\ provides a microfoundation for such aggregate persistence. The empirical evidence indicates that...

We explore the business-cycle implications of agency problems between firms and financiers. We show how these problems create liquidity shortages that can lead to corporate bankruptcy, and may generate aggregate, endogenous cycles in an economy that otherwise would have had a unique, stationary...

We study the properties of mimicking portfolios in an intertemporal APT model, in which the conditional mean and covariance matrix of returns vary in an interdependent manner. We use a signal extraction approach, and relate the efficiency of (possibly) dynamic basis portfolios to mean square...

Poland's current challenge is to somplete its transition to a fully developed market economy, while advancing towards integration into the European Union. This paper is devoted to analyzing the Polish labor market's main institutions, circa 1995, in the areas of labor reallocation, wage setting,...

In an economy with one riskless and one risky asset, we compare the Sharpe ratios of investment funds that allow: i) timing strategies which forecast the market using simple regressions; ii) a strategy which uses multiple regression instead; and iii) a passive allocation which combines the funds in...

This paper presents the most recent literature about Equilibrium Search Models with wage posting. Starting with the basic Burdett and Mortensen (1998) model, I describe the main consequences of departing from its two main assumptions: random matching and a linear production function. I show how...