Economics

Please answer the following questions and give 3 examples for each that could be related to students or goods or services students consume. Once you have posted your replies you must then review/respond to 2 other students post.
1) With alternative policies like income subsidies and directed construction subsidies readily available, why do governments enact price floors and price ceilings?
2) When most people want to know the cost of an item or a service, they look for a price tag. When economists want to determine cost, they go one step further. They use the idea of opportunity cost. Explain the concept of opportunity cost.