"When you have a supply chain system that is push-based, items are "pushed" through the chain from production to retailers, meaning the trigger to do production is based on forecasted demand. A "pull-based" supply chain system doesn't rely on prediction and distribution is driven by demand. In reality a majority of retailers adopt a strategy of both, and they both have their advantages and disadvantages. However, one of the main reasons the pull system is favored by many organizations is because it allows supply chains to adapt to demand more quickly and allows for store differences and stock keeping units (SKU)."