Final answer:
Taylor's Scientific Management is the theory that suggests money is the primary motivator for work. Other theories like Maslow's Hierarchy of Needs and McGregor's Theory X and Theory Y indicate that motivation is multi-faceted and not solely monetary.
Step-by-step explanation:
The theory of motivation that states that money is the only thing people work for is Taylor's Scientific Management. This theory emphasizes the analysis and synthesis of workflows with the main objective being to improve economic efficiency, especially labor productivity. The primary focus of Taylor's approach is on incentivizing workers monetarily to increase output and efficiency.
On the contrary, other theories of motivation such as Maslow's Hierarchy of Needs, Herzberg's Two-Factor Theory, and McGregor's Theory X and Theory Y suggest that there are various factors beyond just money that motivate people to work. Maslow's Hierarchy of Needs, for instance, posits that there are multiple levels of needs that drive human behavior, from basic physiological needs to self-actualization.