initial attachment research from Bowlby suggested that infants have a biological drive to form attachments to one main caregiver
later research by Schaffer and Emerson suggested infants can form multiple attachments, particularly to father
had economic implications in terms of 'stay at home mothers' who have been out of workplace
however, not psychological research has focussed on high quality substitute care, it's more common for women to go back to work and for father to stay-at-home and women to be higher earners
anything to do with mental health and cost implications in terms of absence from work and treatment costs is relevant here
treatments for mental health need to be evaluated in terms of cost effectiveness, some treatments may act quickly on nervous system, if patients relapse when they cease treatment it may not be considered effective.
research shows people are less likely to relapse into depression if they're treated with CBT so it might be expensive initially, in long term it might be economically more beneficial if people have less time off work