How does economic disadvantage accumulate for single mothers‪?‬ DIAL

In Episode 7 of Series 2 of our podcast we talk with Professor Susan Harkness from the University of Bristol and PI of DIAL's EQUAL LIVES project about how economic disadvantage accumulates for single mothers and the impacts on their income and risk of poverty of having a child and splitting up from a partner.
The Accumulation of Economic Disadvantage: The Influence of Childbirth and Divorce on the Income and Poverty Risk of Single Mothers is research by Professor Susan Harkness of the University of Bristol and is published in Demography.
 
Transcript
Christine Garrington  0:00
Welcome to DIAL a podcast where we tune in to evidence on inequality over the life course. In this series, we discuss emerging findings from DIAL's Equal Lives project. Our guest today is Professor Susan Harkness from the University of Bristol and PI of Equal Lives. She's been looking at how economic disadvantage accumulates for single mothers, and the impacts on their income and risk of poverty of having a child and splitting up from a partner. I started by asking her about the background to her research.
Susan Harkness  0:28 
I think for a long time, there's been an assumption that single mothers are more likely to be poor or living in low income because they're not living with a male breadwinning partner. And I think one of the things that's been much less well recognised is that in the US, but also elsewhere, single mothers are much more likely to be poor than single fathers and I think one of the reasons for this is not just that they don't live with a partner, but also because they face an enormous economic hit because of motherhood. And I think the motherhood penalty. We know, we know it exists. We know mothers are much less likely to work than fathers. And when they do work, that they're more likely to be paid less. And what I wanted to do was try and connect to this research with research from single parenthood to see what the impact on single mothers' incomes was.
Christine Garrington  1:16 
So what was it here that you wanted to look at specifically and why then?
 
Susan Harkness  1:21 
Okay, so I wanted to think about why single mothers were more likely to have low income so what was the penalty to single motherhood? And in doing that, I wanted to think about single motherhood is a process that sort of evolves over the life cycle. So first of all, we know that mothers when they have children, they face this economic penalty in the labour market, and then when they separate, they're left in this very vulnerable position because their employment earnings have just declined so much.
Christine Garrington  1:49
And for this research, where did you get your information from? And can you tell us sort of why it is a good source for for looking at these particular issues? 
Susan Harkness  1:58 
Yes, so we looked at data from the Panel Study for Income Dynamics and it's a great source of data because it allows us to look at people over time. In the case of our study, we've followed them for over 10 years, since becoming mothers to look at what happened to their incomes around these kind of critical lifecourse transitions. One of the great advantages of it is that we can see how people were doing before they became single mothers and we can see how they were doing after and then we can kind of look at how each of these different life course events - motherhood, partnership dissolution - leads to changes in their economic circumstances. Another major advantage of this data is that it's got a really large sample size, and therefore we can think a bit more also about the heterogeneity the experience of single mothers. And what we mean here is that we can think about whether all single mothers effectively look the same or whether different routes into single motherhood have a different impact on their incomes. So what we did in this particular case was think about how single mothers differ according to whether the