sentences:  This way the manufacturer can stock up on white umbrellas early with minimal labor costs, and be sure of the demand before they dedicate time and money into predicting the demand so far in the future.Postponement has a rich history in terms of research conducted by hundreds of scientists.According to numerous logistics journals, Supply Chain Management books and articles, the postponement concept has three key dates in its development in the 20th century – 1950, 1965 and 1988.