Firms charging an identical price will always be the case in perfect competition since any firm that charges more than the going market price will...

Firms charging an identical price will always be the case in perfect competition since any firm that charges more than the going market price will sell nothing. In price-setting among oligopolists there is usually a bit of dispersion among the prices.

So if there is some dispersion of prices and service among a few oligopolists, how much is this price dispersion and what are the differences in service? Take a look at the companies providing domestic airline services in Canada and use this to describe the differences.