Rahul is a businessman who owns a company that is popular for its shoes, boots, footwear and other allied accessories. Rahul is hugely dependent on Rohit, a tannery owner in Kanpur, for the supply of leather. Rohit also relies heavily on Rahul, to know the type of leather in demand, in the market, and the quantity required. This particular relationship helps both, Rahul and Rohit, to stay afloat in the market. The following situation explains the concept of __________ between Rahul and Rohit.