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Wikipedia: In addition to the possibility for grocers to join the wholesaler's voluntary branch company, there were grocers who organized themselves into purchasing associations, in order to obtain sufficient purchasing volume from the wholesaler and manufacturer. Examples of this are the Cooperative Purchasing Association Nederlandse Kruideniersbond (Enkabé) in 1929 and the Sperwerverbond in 1931. The functioning of these organizations did not differ much from the voluntary branch company. The Sperwerverbond still exists in 2007 and manages the PLUS and SPAR formulas, with which it is mainly active in the sector of smaller neighborhood supermarkets. https://nl.wikipedia.org/wiki/Grocery
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