Economist Daniel McFadden has analyzed people's decision-making process in depth. In his research, every choice that people make can be seen as a choice made among a limited number of possibilities. Everyone has a Xiaoyong Function, the purpose is to maximize the utility. For example, whether to go to work on foot, car or car is an optimization problem involving multiple features. It includes features such as actual expenditure, travel time, waiting time, comfort level, etc. People can according to Your own preferences weigh and compare different features and finally determine the best way. What does this text mean? ['The principle of maximum utility affects every decision people make.', 'The best way to solve a problem is often a matter of personal preference.', "People's decision-making process is not only linear but also multi-dimensional.", 'Different people make different decisions under different conditions.']