in which layer of the atmosphere do the radio wave signals bounces off? Explain the importance of this characteristic to use​

The ionosphere is ionized by solar radiation. It plays an important role in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.Hope it helps...

Economy is the answer

Answer (b) they're often rural migrants with no title to housing or rights to established businesses