encouraging touch in a retail store may increase the feelings of perceived ownership and influence the amount a customer is willing to pay for a product.

--- 여기서 the amount 다음에 목적격 관계대명사 that 이 생략된게 맞나요?ㅠㅠ 해석으로는 형용사절처럼 해석이 되는 것같아서요..ㅠ.ㅠ