This paper deals with instability in regression coefficients. We propose a Bayesian regression model with time-varying coefficients (TVC) that allows to jointly estimate the degree of instability and the time-path of the coefficients. Thanks to the computational tractability of the model and to...

We investigate the empirical relationship between product market competition and prices in the retail grocery sector in the euro area. The study uses micro-data from ACNielsen on chain stores' census characteristics and price levels for a broad variety of products. We construct...