當時的百貨公司，以「誠信商法」為主，只要商品有缺陷就可以退錢或換物，為

當時的百貨公司，以「誠信商法」為主，只要商品有缺陷就可以退錢或換物，為消費者帶來很大便利。

結果 (英文) 1:

At that time the department stores, with "good faith commercial law" based, as long as the merchandise is defective or refund can barter for consumers great convenience.

結果 (英文) 2:

At that time, department stores, to "good faith business law" mainly, as long as the goods are defective can be refunded or exchanged, for consumers to bring great convenience.

結果 (英文) 3:

At that time, department stores were mainly based on the "good faith business law". As long as the goods were defective, they could return money or exchange goods, which brought great convenience to consumers.