Huff’s model, also known as the gravity model, is a mathematical framework used to predict the flow of people or goods between different locations. It takes into account factors such as distance, population size, and attractiveness of each location to determine the likelihood of movement between them. This model has been widely used in urban planning, transportation, and retail industries to understand and optimize the distribution of resources and services. Developed by David Huff in 1963, it remains a valuable tool for analyzing human behavior and decision-making in spatial contexts.