noun
economical product; economy-sized goods
Refers to products that offer good value, often in larger quantities or at a lower price per unit.
この洗剤は徳用品だから、普通のよりお得です。
This detergent is an economy-sized product, so it's a better deal than the regular one.
徳用品を買うと、長い目
Buying economy-sized goods saves money in the long run.
経済的 is a broader term meaning 'economical' or 'economic', not limited to products.
Compound of 徳 (とく, 'benefit, profit') + 用 (よう, 'use') + 品 (ひん, 'goods'). The exact historical derivation is uncertain, but the meaning is transparent from the components.