What might be a general distinction between oligopolist that advertise and those that don't?

Oligopolists that advertise often seek to differentiate their products or services in a competitive market, aiming to build brand loyalty and increase market share. In contrast, those that don't advertise may rely on their established reputation or focus on price competition, possibly due to lower costs or a more stable market position. Advertising can also indicate a more dynamic strategy to respond to competitors, while non-advertising firms might prioritize efficiency or cost leadership. Ultimately, the choice to advertise reflects different strategic priorities and market conditions within the oligopoly.