We proceed pretest to choose dental floss (convenience goods), clothes softener (preference goods) and icebox (shopping goods) as the product types of the study.

• 本研究先进行前测，在产品种类部分，选取牙线（便利品）、衣物柔软精（偏好品）与冰箱（选购品）做为研究之产品类别。