Suppose an environmental impact study shows that the coral reef near Port Douglas, Australia, can sustain 20 scuba diving tours per week. Using a quota of 20 dive tours per week will have the following advantage over a tax: The quota will better ensure that the sustainable amount of dives will occur. The tax will only allow wealthy divers to receive the benefit of diving near the reef. The quota will ensure that those divers who receive the greatest benefit will be the ones diving near the reef. The quota is more efficient than a tax.