Individual consumer behavior is influenced by motivation, personality and perception. Motivation is the driving force that impels consumers to action and is produced by unfulfilled needs. Maslow's hierarchy of needs theorizes that humans are motivated to fulfill physiological, safety, social, esteem and self-actualization needs sequentially. Marketers can use this framework to target products at different need levels and position products by appealing to specific needs. Other motivation theories include identifying power, affiliation and achievement as basic human needs, and distinguishing between rational and emotional motives for consumer choices.