An electronics company sells a range of tablet computers. Tablet computers come complete with an operating system that is regarded as the market leader. The company aims to launch a new version of its hardware every eighteen months and a major update to its software every three years. The latest version of the tablet computer is always sold at a higher price, but the older version that has been replaced is then sold for a time at a discounted price.

Which pricing model does this company appear to be using?