This document discusses several theories of entrepreneurship and entrepreneurial motivation from economic, sociological, and psychological perspectives. It outlines McClelland's theory of achievement motivation which found that individuals with a high need for achievement are more likely to become entrepreneurs. It also summarizes McClelland's acquired needs theory that entrepreneurs have the highest need for achievement compared to the needs for power or affiliation. Finally, it discusses McClelland's Kakinada experiment which showed training can induce achievement motivation and positively impact entrepreneurial performance.