Discussion
The cooperative principle, along with the conversational maxims, partly accounts for conversational implicatures. Participants assume that a speaker is being cooperative, and thus they make conversational implicatures about what is said.
Example (English)
When a speaker makes an apparently uninformative remark such as “War is war,” the addressee assumes that the speaker is being cooperative and looks for the implicature the speaker is making.
Source:
Levinson 1983 110–111
Sources
Levinson 1983 101–104, 110–114
Grice 1975 45–46, 49–50
Crystal 1985 153