How is the person paid? Wage salary, by sale, or job done unpaid.
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Wages or salary: Such people are employed and are paid regularly in cash. A wage earner is paid in cash on an hourly, daily, or weekly basis. A salary earner has his or her pay assessed on an annual basis. Write 'wage' or 'salary' as appropriate.

By sale: Such people are paid in cash when they sell some thing or some service. They are self-employed and do not receive a wage or salary. A cane farmer is paid for the cane he or she sells. A person who runs his own shop is paid for each article sold. A market vendor is paid for the food sold. The same is true of people who grow vegetables, root crops, raise chickens or catch fish to sell. For such people write 'sale'.

By job done: This category includes casual workers and everyone who is paid on a contract, task or piece work basis. They do not receive a regular wage or salary. This kind of arrangement is common in rural areas -- for example, in cane cutting gangs or fencing on contract -- as well as in urban areas -- for example, grass cutters, casual laborers and stevedores. For such people write 'job'.

Unpaid: Such people work but do not receive regular wages. Very often they work in the family business or farm and are members of the family who are provided with food and lodging and share in the benefits of any profits which arise from the joint family work but do not receive cash on a regular basis. For such people write 'unpaid'.