Public procurement is a process whereby the public sector buys from private suppliers the goods, services and works it needs to accomplish its functions. It aims to obtain the best 'value for money', 'in a timely, economical and efficient manner'.1 This traditional procurement's goal was re-defined by scholars and policymakers to give space to non-economic objectives through the so-called sustainable public procurement (SPP).2 SPP pursues economic, environmental and social objectives within the

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... purchasing process.3 Therefore, 'social' is one of the three dimensions that makes sustainability possible, and human rights are the backbone of social sustainability.