Some items, such as pharmaceutical companies, which have the monopoly on power sales to particular medications, the company is required to purchase items from that company.
Some products, such as pharmaceuticals and medical supplies. Some companies have a monopoly on the sale of drugs that the company was obliged to purchase from the Company.
Certain types of goods, such as medicine, some companies which have monopoly power in the sale of the drug company. Therefore, it is necessary to order goods from that company.