That's despite economy-wide income growth over the last 30 years.
Poverty and deprivation are still high for lone parent families.
The incidence of income poverty and deprivation remains closely linked to the absence of anyone in paid work.
The new ESRI research also shows income growth has been strong over the last 3 decades.
Its Economist, Barra Roantree says income inequality came down before covid 19, but some groups are suffering:
Income growth increased up by 3.6 per cent per year for those on the lowest incomes and rose 2.7 per cent for the highest earners.
But Barra Roantree says lone parents are going through high levels of poverty:

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