Soundproof rooms take advantage of which property of waves?
the subject is actually science, but could not find it on options!

We consume for various reasons. sometimes we buy in order to reduce suffering (medicine), or to give pleasure (movies), or to feel safer (a lock), to become wiser (education), or to be more comfortable (a chair). what is the one word used by economists that includes all these meanings? a. cost b. price c. demand d. benefit