I'm looking for as many empirical "stylized facts" about price dispersion (in products markets) in the idea of Burdett and Judd (1983) as possible.
- how high is the variance of price dispersion over different markets?
- Is there a time trend in price dispersion?
- How does price dispersion vary over the business cycle?
For the last question, I only found Cornia et al (2011), who show that it is very pro-cyclical for airlines - probably not the most generalizable result.