Phosphorous is a key element in most fertilizers, and most phosphorous is mined from the ground. Almost all of the phosphorous mines in the world are owned by two entities. Is phosphorous a potential source of competitive advantage for these entities? If not, what characteristic is phosphorous lacking?

Phosphorous is a key element in most fertilizers, and most phosphorous is mined from the ground. Almost all of the phosphorous mines in the world are owned by two entities. Is phosphorous a potential source of competitive advantage for these entities? If not, what characteristic is phosphorous lacking?