Quano Inc. decides to produce a 3D-display phone, Chel, which is a much-anticipated release. Most buyers are disappointed within a week because of heating issues. Quano announces immediately that it would replace the defective phones with a rectified model. The new Chel arrives two months later and has a few issues that are taken care of by a software upgrade. This prompts a flood of sales. After six months, Quano releases a new 3D-phone and drops the prices of Chel by over 40%. Jason who has been waiting for this opportunity buys a Chel immediately. In this scenario, Jason is one among the _____.