Why is investment so critical in determining the level of prosperity?

Answer following questions:1.why is investment so critical in determining the level of prosperity?2. you grandmother heard you were studying economics and decided to make use of your knowledge. She is selling her house and wants to know what price to ask for her well-kept house in a growing neighborhood. you need more information: what did it cost her? she says it cost $20,000 forty years ago. With these givens, advise her on her asking price.