About the disadvantages of concentration of ownership, which means small companies that are under the control of large companies. So The small companies can not be able to establish their own companies. If they want to produce the products or sell the products they can not directly do it because every operations must be allow or accept by the large company before, that makes the small companies not have freedom to thinking, cooperation including operation because if they do more than a large company's allow,it may have affect in law and it can make damages to small companies.