Final answer:
Andrew Carnegie demonstrated following his own advice through his philanthropic actions and business strategies, as shown in his funding of public institutions and adopting business practices like vertical integration and prudent management of profits.
Step-by-step explanation:
Andrew Carnegie is well-known for his rags-to-riches story and his subsequent philanthropy. One piece of evidence that shows Carnegie followed his advice is through his essay, The Gospel of Wealth, where he argued that the wealthy have a responsibility to be benefactors to the less fortunate. This philosophy was reflected in his own life through his extensive philanthropic efforts, where he funded numerous libraries, schools, and institutions of higher education. Moreover, Carnegie's business strategies also mirror his principles. He practiced vertical integration and was known for his thrifty management of profits, using them to buy out competitors during economic recessions, which allowed him to dominate the steel industry. Carnegie's belief in the ideals of American capitalism and his own experience, starting from humble beginnings and rising to the top of the steel industry, serve as real-life examples of his philosophy. His combination of hard work, ingenuity, and a bit of luck helped him amass a fortune, which he later used in accordance with his belief that the wealthy should find proper uses for their wealth by funding public institutions, showcasing that he indeed followed his own advice.