This article discusses how researchers use a Computable General Equilibrium (CGE) model to measure the effects of infrastructure systems, like transportation, on the economy. They studied how different factors, like changes in policies, can impact economic systems. The researchers found that CGE models can simulate these impacts by considering regional economic differences and how industries affect each other. They also highlighted challenges related to accurately setting parameters and identifying the effects of policy changes, showing the need for more research in this area.