Urban spatial structure is constantly changing, affecting the city's economy. By using economic and urban theories, researchers created a model to simulate how a city's spatial system works. They found that factors like supply and demand, transaction costs, and individual behavior determine how a city operates. The study also showed that there are optimal times and locations to build new towns within a city. This means that planning new towns should be based on a thorough analysis of the city's spatial system. The study also found that sensitivity analysis can be useful in urban science.