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First, letâs define each of these terms: 1  Push System: is a system in which we produce goods based on our best projections of what the market wants. 2  Pull System: is a system in which the production of goods is initiated by the person or organization who consumes that good.
In a pulley system, one end of the rope is attached to the load and the other end is pulled in order to move or lift the load. A single pulley has only one wheel. The pulley makes the task of lifting a load more convenient since it is easier to pull a rope down than it is to lift a weight up.