Why do accountants use "Standard Cost" instead of "Actual Cost" in computation of "Product Costs"?

Accountant use Standard Cost instead of Actual cost, because in standard cost they don't need to filter the market value of each and every component, and they are well aware of the product which is been produce in the same market again and again, that's why they are using the standard costing method instead of actual costing method for the same product again and again.