Public procurement can be used to achieve goals other than purely economic ones. Such goals are often referred to as "social linkages". A preference for social considerations has been gaining ground against the dominant best value for money (BVM) paradigm over the past few decades. In the past, public procurement policies followed the principle of non-discrimination and free competition beyond national boundaries. Today considerations other than (purely economic) BVM have become relevant in public procurement policy and practice. Examples of social linkages in public procurement are found in various countries, from the well-known 'Affirmative Action Programs' in the US that advance minorities, women, persons with disabilities and veterans, 1 to specific set-aside programs made available to only less-competitive businesses, such as womenowned businesses, minority-owned businesses, businesses operating in economically disadvantaged areas, etc. Set-asides can be seen as social procurement linkages through the promotion of both supplier diversity and employment. The latter means that social use of public procurement can positively impact employment by providing opportunities to workers who are generally excluded from the labour market, while the former means that chances are given to less-competitive bidders. Set-aside programs have been widely developed in the US, which has a long tradition of set-aside contracts for special classes of small businesses, including small disadvantaged businesses, and in Canada where set-asides have been introduced for the development of Aboriginal businesses. However, the restriction of full and open competition that set-asides entail is frequently criticized by EU institutions. Despite this, the new European procurement framework also seems to have established set-asides as a means of providing economic opportunities to disadvantaged groups.

Strategic objectives in public procurement, such as environmental or social considerations, are being increasingly referred to under the umbrella term of sustainable public procurement (SPP). The concept of sustainability is intrinsically multidimensional, encompassing environmental, social, and economic aspects. However, the existing literature on SPP highlights the generalization that the regulation and practices of public procurement are biased toward the environmental dimension. There is conflicting evidence from countries in Sub-Saharan Africa (SSA) that calls for further investigation. Analyzing how SPP is actually constituted in SSA and contrasting it with the situation in the European Union (EU), as a spotlight on the Global South and North, contributes to a better understanding of sustainability in public procurement. The comparative analysis will help with understanding processes related to the integration or disintegration of sustainability dimensions in SPP. Our results indicate a contrary orientation on the environmental and the social dimensions in the EU and SSA. Although there is no sign of a comprehensive integration of all dimensions in SPP, there are developments toward the integration of the ‘missing’ dimension in the respective regional setting. Thus, at the moment, achieving a multidimensional implementation of SPP appears to be more a matter of expanding SPP practices of the ‘missing’ dimension than of pushing for integrated concepts.