5.1.50 How much do you earn from this activity in a normal month (on average)?
Imputation and derivation
Imputation
5.1.50 How much do you earn from this activity in a normal month (on average)?
Others
Security
5.1.50 How much do you earn from this activity in a normal month (on average)?
Notes
"5.1.50 How much do you earn from this activity in a normal month (on average)?"
"4.1.40 How much did you usually earn from this activity in a normal month?"