market structure and the geographic distribution of brand shares in consumer package goods industries bart j bronnenberg sanjay k dhar jean pierre dubé july 18 2006 abstract we describe industrial using a unique database spanning 31 cpg 39 months 50 largest us metropolitan markets organize our description around notion that firms can improve perceptions through advertising investments as sutton s endogenous sunk cost ory data observed levels escalate ie larger brands while number advertised within an industry remains stable correspondingly concentration intensive are bounded away from zero irrespective size for two collect historic order entry is found to account rank orders covariation perceived qualities ef fort interestingly alternative potential sources asymmetry on both supply demand sides do not mimic patterns general findings highlight several striking persistent structures