суммарная стоимость владения(a calculation of all the costs involved in buying and using a product over time: "Outsourcing services can dramatically cut the total cost of ownership. CBED Alexander Demidov)
совокупная стоимость владения объектами(a method of calculating the costs involved in buying and using a product or service which includes the cost of buying it and other costs such as ordering, delivering, keeping it in good condition, etc: The new system will give customers improved software performance and a lower total cost of ownership. OBED Alexander Demidov)