Business
Business is the activity of making one's living or making money by producing or buying and selling goods or services. Simply put, it is "any activity or enterprise entered into for profit. It does not mean it is a company, a corporation, partnership, or have any such formal organization, but it can range from a street peddler to General Motors." The term is also often used colloquially (but not by lawyers or public officials) to refer to a company, but this article will not deal with that sense of the word.
Business Administration
Business administration is management of a business. It includes all aspects of overseeing and supervising business operations and related field which include Accounting, Finance and Marketing.
Leadership
Leadership is both a research area and a practical skill encompassing the ability of an individual or organization to "lead" or guide other individuals, teams, or entire organizations. Specialist literature debates various viewpoints, contrasting Eastern and Western approaches to leadership, and also (within the West) United States versus European approaches. U.S. academic environments define leadership as "a process of social influence in which a person can enlist the aid and support of others in the accomplishment of a common task". Leadership seen from a European and non-academic perspective encompasses a view of a leader who can be moved not only by communitarian goals but also by the search for personal power.
Leadership
It is not a question of how well each process works, the question is how well they all work together.
Lloyd Dobyns and Clare Crawford-Mason, in Thinking About Quality : Progress, Wisdom, and the Deming Philosophy (1994)
Leadership
Leadership is a quality of those who earn the respect of others through the wisdom of the combination of their words and their actions.
Walter Grant IV, past President — University of Redlands Whitehead Leadership Society. As quoted in Leadership Greatness: Best Practices To Become A Great Leader By Tri Junarso
Business Administration
To those who run businesses, profits are obviously desirable and losses deplorable. But economics is not business administration. From the standpoint of the economy as a whole, and from the standpoint of the central concern of economics — the allocation of scarce resources which have alternative uses — profits and losses play equally important roles in maintaining and advancing the standards of living of the population as a whole.
Thomas Sowell, Basic Economics (4th ed., 2010)