National Assistance (now Income Support) once had a payment limit known as
The Wage Stop.
This was a very complex calculation that we civil servants dreaded having to do.
The basis of it was the wage of a local council labourer.
Applying it ensured that where a large number of children would cause the 'normal' calculation to provide for a high rate of payment of National Assistance, then this Wage Stop would limit it to what that family could receive if the 'breadwinner' was employed as a council labourer.
After studies into 'child poverty', that rule was abolished in 1975
http://hansard.millbanksystems.com/c...wage-stop-rule