Why is it essential to implement a costing system especially now?

We are facing a major economic crisis. In this specific period it’s essential to implement a costing system in order to:
Support the company pricing policy
Determine the products and the customers profit and to allocate more resources on profitable products/customers
Monitor the products cost and to control the cost at individual level and on departmental level
Identify inefficient product, department and activity
Evaluate the inventory value
Determine the “red line” for strategic /marketing decisions
Determine & measure the current capacity usage