Jim is trying to determine the level of his store's attraction by using the square footage as a measure of breadth of merchandise and the distance to the store from different geographic areas. Which model is he using?

Answer: Retail gravitational model

Explanation:

According to the theory of retail gravitation introduced by William Reilly which stated that consumers tend to travel long distance to huge retail stores and centers which are attractive to consumers. Measure between the retail trade taking place between two cities to measure the trade boundary.

According to the situation mentioned in question, retail gravitational model is being used by Jim. He is measuring the merchandise and store with the different areas geographically to determined customers attraction towards the store.