Examines service performance through in-house and contracted modes in children’s social care services, suggesting effective portfolio design is crucial.
Concurrent sourcing, the simultaneous use of in-house provision and contracting out, remains underexplored. This study examines how the allocation between in-house and contracted modes in service delivery portfolios affects service performance. Using panel data on children’s social care services provided by English local authorities from 2014 to 2023, we find that concentrated portfolios, in which one delivery mode dominates and the other plays a supporting role, are associated with better performance. By contrast, dominant mode itself and the mix of contractor types within outsourced provision show limited influence. The findings highlight portfolio design as central to concurrent sourcing.
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Li et al. (2026) studied this question.
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