What is meant by the term product costs? What is meant by the term period costs? Why does it matter whether a cost is a product cost or a period cost? Can you compare direct costs vs indirect costs, what forms would you use to indicate both? Give an example of a cost at a company that could be a direct cost at one level of the organization but would be considered an indirect cost at a different level of that organization . Explain why this same cost could be both direct and indirect (at different levels). Please with citations , references and sources of citations and references.