&gt; Probably because that&#x27;s not tracked as a profession beacuse it&#x27;s not really one.<p>Anyone who thinks being a homemaker is not a profession has no clue what it entails. If you consider a couple as a single unit, it&#x27;s simply optimizing by specialization. When you look at the cost of baby-sitting&#x2F;nannies it makes a lot of sense too. Why make $40K extra if I&#x27;m going to spend $35K on a nanny?<p>&gt; You are tracked by what you actually learned.<p>No you&#x27;re tracked by what your current position is. I&#x27;m pretty sure that office assistants who studied literature are still tracked as office assistants.<p>&gt; People become stay at home mums&#x2F;dad in the relationship, not before.<p>Exactly and this data represents a set of married people, not a set of jobs. If it doesn&#x27;t include homemaker as an option then you&#x27;ve excluded all married single income households.