“Industry”, “Business” and “Sector”.

Define “Industry”, “Business” and “Sector”. How are these related?
How can Porter’s five-forces model aid in strategic decision making?
Describe how “Risk of Entry”, “Bargaining Power of Buyers”, “Bargaining Power of Suppliers”, and industry competition (“Threat of Substitutes”) affect the external threats a company faces. Provide examples of each.
Describe the industry life cycle, what strategic groups are, and what mobility barriers are.