Title screen

[References: p. 284-285 (9 tit.)]

The work describes the main stages of the life cycle relating to engineering products, including design, manufacture, operation and product disposal. The work proves that the stage during which a product is used is decisive in the market economy, as the customer makes a decision as to the reasonability of the product purchase. A binary formula is proposed for determining the ongoing reduced costs of using a product. The concept of economically optimal product service life is introduced. We propose formulae for calculating economically reasonable service life and ongoing per-unit operating costs. The problem of replacing old products with new ones is analyzed with a focus on minimizing operating costs. The formulae have been derived for determining the point of time for the cost-effective replacement of old products. The limits and ranges are established within which the consumer has the benefit of products replacement. The results can be used as basis data for designing and manufacturing engineering products.