7. Costing & Pricing Decisions - Write an essay on the practice of cost allocations (particularly joint costs, sunk costs, and opportunity costs) and pricing decisions (e.g., cost-plus pricing, target costing, and activity-based pricing) in corporations. Include in your discussion the major differences in those various approaches and their appropriateness in the context of the nature of costs, industry differences, competitiveness, etc. Also relate the implications for firm's profitability (