The article introduces a new model that combines two types of economic models to better understand the effects of trade policies. They want to bridge the gap between highly general or highly detailed models to help trade negotiators. By linking a partial model that focuses on specific sectors with a general model that looks at the entire economy, they can predict the impact of trade reforms more accurately. The researchers found that using the combined model provided a more realistic view of the effects of tariff changes on the Indian economy, especially in the auto industry. The linked model showed a clearer picture of both overall welfare gains and changes within the industry compared to using just one type of model.