It differs from the monopolization in the modern times in that the bakufu and domains did not directly manage it but made merchants and wealthy peasants do it by contracts and robbed the profits of them.
幕府・藩が直接経営者となるのではなく、商人・豪農に請け負わせ、その利益を収奪するところに近代以降の専売制度との違いがある。