Which of the following is an example of Stackelberg competition?
GlaxoSmithKline and Pfizer compete in the HIV drug market by annually announcing their production quotas during the second week of January.
Natura Pet Products introduced the first grain-free dog food; eventually, other dog food companies entered this market but had to limit their production plans, given Natura Pet Products' sizeable market share.
A price war between American Airlines and United Airlines leads to both airlines setting ticket prices equal to marginal cost.
Firestone offers consumer rebates to keep its tire prices below Goodyear's.