In order to comprehend the ontological construction below, please refer to the respective posts for all notions in italic.
The fragmented to a couple (two or more) parts monopsonistic demand on the oligopolistic market is oligopsony. The demand side of the oligopolistic market is given through the split monopsonistic demand. Oligopoly reveals the joined supply on the oligopolistic market, so it is a joined oligopsonistic demand. A supply is for the purpose of demand, and a demand can be back by a counter-demand for the market exchange really to happen. Thus, a monopsony is built up as a buyer who requires an extra buyer, and they create the market demand together. Oligopsonistic consumer surplus (profit) is derived in the same way as the monopsony consumer surplus: seeking a price for the commodity which is equal to the minimal acceptable contribution in the consumption of commodity’s last part.
Historical Backdrop
• KNUT WICKSELL Lectures on Political Economy: joint demand.