In Nigeria, the northern Fulani are traditionally herdspeople who derive income from animal husbandry. Repeated droughts in the North, however, have forced Fulani tribes to migrate to the South in search of water and pastures for their herds. As they migrate into lands that are owned by predominantly farming communities, violent conflicts have erupted. Which of the following is true (select all that apply)? Group of answer choices Fulani cattle sometimes wander onto farmed land and eat crops. From the perspective of the Fulani, farmers' crops provide a positive externality From the perspective of farmers, the Fulani herds are a negative externality A few water agencies have chosen not to raise prices on surrounding town residents, who seeing the reservoir levels decline, start to increase their own water consumption. The result is a tragedy of the commons. In some cases, residents of surrounding towns have increased water consumption to such an extent that the state water agencies have raised water prices. In this case, these town residents have caused a negative externality. Finally, still other water agencies have imposed a water-use fee on the Fulani. This is a "Coase" bargain