What are the assumptions of transportation problem?

The transportation problem is based on several key assumptions: first, it assumes that the supply at each source and the demand at each destination are known and fixed. Second, it presumes that the transportation cost per unit between each source and destination is constant. Third, it assumes that all units of goods are identical and can be transported without loss or damage. Lastly, it is typically assumed that all supplies and demands can be completely fulfilled without any surplus or shortage.