Modern multiunit businesses replaced small traditional enterprises when administrative coordination through a managerial hierarchy allowed for greater productivity, lower costs, and higher profits than market coordination. The advantages of coordinating many business units internally could only be realized once managerial hierarchies had been established. These hierarchies then became a source of permanence, power, and continued growth for the large enterprises. As businesses grew in size and diversity, management became more professional and separated from ownership. Career managers prioritized long-term stability and growth over short-term profits. Large enterprises eventually altered the structure of the economy.