Sunk costs:

Here are some ways cost accounting can help with decision making: Pricing: Cost accounting can help managers determine the cost of production and selling price of a product or service. It can also help businesses formulate competitive pricing strategies. Outsourcing: Cost accounting can provide information for decision-making related to outsourcing and make-or-buy decisions. Resource allocation: Cost accounting can help businesses make informed decisions about resource allocation. Budgeting: Cost accounting can help managers optimize resources, control costs, and achieve organizational... Show more

Here are some ways cost accounting can help with decision making:
Pricing: Cost accounting can help managers determine the cost of production and selling price of a product or service. It can also help businesses formulate competitive pricing strategies.
Outsourcing: Cost accounting can provide information for decision-making related to outsourcing and make-or-buy decisions.
Resource allocation: Cost accounting can help businesses make informed decisions about resource allocation.
Budgeting: Cost accounting can help managers optimize resources, control costs, and achieve organizational goals.
Performance measurement: Cost accounting can help managers measure performance and evaluate investments.

Here are some cost accounting decision models:
Activity-based costing: Assigns costs to each activity in the value chain based on their use of resources. This method provides a more accurate view of the cost of each activity, which helps businesses make informed decisions about optimizing their operations.
Standard costing: A technique of cost accounting where the cost of a product or service is predetermined. The actual cost of the product or service is then ascertained, and the comparison between the standard cost and the actual cost is made.
Marginal costing: A type of cost accounting used to assess the impact of variable costs on the total volume of output or production.
Relevant costing: A cost accounting based evaluation technique that applies basic principles to business decisions.
Breakeven analysis: Also known as CVP analysis, this uses the marginal production cost to calculate the number of units that must be sold to fully cover the cost of production.
Process costing: A cost accounting technique used to allocate costs to products or services that are produced through a continuous production process. 

Other cost accounting decision models include: Cost control and Lean accounting. 

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