Mujirushi (no-brand) Ryōhin (quality goods) began as a product brand of the supermarket chain The Seiyu, Ltd. in December 1980. The Mujirushi Ryōhin product range was developed to offer affordable quality products and were marketed using the slogan “Lower priced for a reason.”

In 1983, the first directly operated Mujirushi Ryōhin store opened. In 1985, Mujirushi Ryōhin started overseas production and procurement, started to place direct factory orders in 1986, and in 1987 Muji started to develop material globally.

In 1989, Ryohin Keikaku Ltd became the manufacturer and retailer for all Mujirushi Ryōhin products and operations, including planning, development, production, distribution and sale. In 1991, Mujirushi Ryōhin opened its first international store in London.

Muji started with only 40 products in the 1980s. Some of their products include pens, pencils, notebooks, storage units, apparel, kitchen appliances, food items, and household care products. Muji has also created an automobile. Muji storefronts such as the one in New York are large and stocked with nearly every single product available. The primary business also includes Café Muji, Meal Muji, Muji Campsite, florist and home furnishing; the company has also engaged in architectural projects such as Muji House.

By the end of the 2000s, Muji was selling more than 7,000 different products. Muji product design, and brand identity, is based around the selection of materials, streamlined manufacturing processes, and minimal packaging. Muji products have a limited colour range and are displayed on shelves with minimal packaging, displaying only functional product information and a price tag. Detailed instructions included with the product are usually printed only in Japanese, although multilingual translations are starting to be included with some products.

According to en.wikipedia