Any kind of business which is direct transferable up to second party can easily known as local services like these river and bay fishermen . They sail in waters, caught around 200 kg of fishes and then they directly sell them in market, without taking help of service and business agents. As far as this info , we might get that those people are businessmen with limited radius-ed effect and hence the life, struggle and hard work is surely non replaceable for their bread and shelter.