Definition
Business sector/type of work is the sector of activity of work/company/business where the household head/member works.
How to determine the main work:
1.If a household head/member in the last one week only has only one work,than it is considered the main work.
2.If a household head/member in the last one week has more than one work,the main work is the one that consumes the most time. If the time spent to do those works are the same,than the work that produces the largest income is considered the main work.