There are a few industrial sites in town, producing essential goods and services for the residents and providing the citizens with vital jobs. However, the businesses, including an airport in the very downtown, also produce pollution, congestion, and noise. People understand the blessings of economic and civil freedoms and are pleased and proud to have productive activities in their town. They started, though, to crave for a more pleasant place to live in. What economic principle can give these people some guidance about what to do?and explain how itapplies.