Final answer:
Citizens supporting local businesses benefits the host communities by generating tax revenue and creating job opportunities.
Step-by-step explanation:
The Chambers of Commerce of cities and towns encourage citizens to buy from local businesses because their role as taxpayers is most important to the host communities. When citizens support local businesses, they contribute to the local economy by generating tax revenue and creating job opportunities. This tax revenue can then be used by the local government to improve infrastructure, education, and other public services for the benefit of the entire community.