True, but their current strategy is to maximise market share. That said, it would be interesting to see what their respective price charts look like over time.

True, but their current strategy is to maximise market share. That said, it would be interesting to see what their respective price charts look like over time. A typical strategy for signalling not-technically-a-cartel price rises is to announce price raise well in advance. If the others don't match, you quietly drop it.