Parenting

Its interesting that over dinner with the CPC bunch at Timbre a topic on parenting was discussed. The topic was that, to make ends meet, parents are unable to give a child proper upbringing. Is this an individual or a cultural or a societal issue/problem? What is the root of the problem? It is proven that a child's social economic status (SES) affect his/her IQ. So nature vs nurture. Which is more important?