Ozzie and Skip are both Yak ranchers. They own a business together called "Ozzie and Skip's Yaks". They are each currently raising 100 Yaks (200 Yaks between the two of them). Ozzie could raise 3 water buffalos for each Yak he is raising. Skip could raise 1 water buffalo for each Yak he is raising. They are not currently raising any water buffalos. Ozzie, raising 100 yaks, and Skip, raising 100 yaks, are each at their maximum capacity for raising yaks or water buffalos during the current period; if they were to raise any water buffalos, they would have to give up raising yaks. ALL the questions below refer back to this basic information.

In terms of Yaks, what is the opportunity cost for Skip to raise a single water buffalo?