What purpose is served by wholesalers providing warehousing facilities?

Two wag purpose is served by wholesalers providing warehousing facilities in the following manner
(i) Wholesalers take delivery of goods when these are produced in factory and keep them in their godowns/warehouses which reduces the burden of manufacturers of providing for storage facilities for the finished products.
(ii) Warehousing by wholesalers relieves the retailers of the work of collecting goods from several producers and keeping big inventory of the same for maintaining adequate stock of varied commodities for the customers.