An e-commerce system offering retail, instant buy, and auction sales models automatically moves items for sale between the sales models according to seller-defined criteria, such as elasticity of demand, cash generation, time in sales model, and quantity in sales model. Each of the center pivot span structures are independently operable with the movements thereof being coordinated by suitable controls. A gradient of the motor speed in a laundry wrapping process is determined, depending on the weight of the laundry. Staffing data includes information technology staff data, employee data, and contractor data. The flexible cable includes a base film having a band shape, a plurality of wiring layers disposed on the base film and extending in one direction, and a plurality of elasticity-adjusting patterns attached to a portion of the base film and partially adjusting the elasticity of the flexible cable.