This can be exemplified from the fact that personal expenditures on durables exceeded the total value of $800 billion in 2000.
According to Cooper (1994, p5)[4] "durability is the ability of a product to perform its required function over a lengthy period under normal conditions of use without excessive expenditure on maintenance or repair".
Several units may be used to measure the durability of a product according to its field of application such as years of existence, hours of use and operational cycles.
Durability, as a characteristic relating to the quality of goods that can be demanded by consumers, was not clear until an amendment of the law in 1994[which?]
This intermediate good should ideally be easy to handle, store and transport (function i).