This paper estimates sectoral mark-ups in the Spanish economy during the period 1983–1996. The data consists of a large firm level data set that encompasses all sectors of economic activity apart from financial institutions. The time period considered is well suited to assess the...

We present a Hotelling model of price and advertising competition between prescription drugs that differ in quality/side effects. Promotional effort results in the endogenous formation of two consumer groups: brand loyal and non-brand loyal ones. We show that advertising intensities are...