Perkins claims that only renumerated employment counts as 'work', so things like child rearing, volunteering, caring etc are not 'work' despite good claims that they are work, just unpaid work.
His personality factors that are the welfare 'trait' are 'low levels of conscientiousness and agreeableness.'
He used data from the ONS on workless households to make some points. (How many points I don't know.) The obvious limitation (to me at least) is that a workless household is only workless at the time of the information collected. It tells us little about whether they were workless before or after the collection. It also doesn't even tell us how many children are in the family, because for obvious reasons, children age, and thus move from being classed as children to adults.
Academics who's studies he used have pointed out that he interpreted their studies wrongly
https://www.iser.essex.ac.uk/blog/2...-reform-affect-fertility-evidence-from-the-uk
He also said that welfare benefits are too generous, and incentivize these welfare traits. His solution is that benefit payments should be limited until a birth rate decline is seen in workless households. Quite how making children living in poor households poorer through no fault of their own is ethical, I don't know.
His comparisons of mice to poor people are 'interesting' although I'm not sure what mice neurons have to do with my own. I'm not aware of a mice welfare state either, although I one day hope to see them fight with each other for a fair share of cheese in accordance with their abilities and needs.
He also comes out with such gems as “If you’re not conscientious in work situations, you’re not going to be conscientious in others, like managing your income to benefit your kids,” which I find personally amusing as having little to do with the world of work that I inhabited. Maybe he thinks that everyone enjoys their jobs?
Statisticians may question why you don't include childless workless households in your calculations that show the likelihood of workless households having children because of the welfare state.
Sociologists might also find the assumptions that the US and UK are so similar that you can extrapolate from one to the other questionable, but that would just be disagreeableness, which is a terrible pathology.