The story of the rise of invincible merchants in another world is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The story of the rise of invincible merchants in another world manga, Muteki Shounin No Isekai Nariagari Monogatari A college student who wandered into a different world with his beloved cat. After discovering the “trading” skill, he decided to grow up in a different world!? He became a merchant and decided to stay in the different world with the knowledge and skill he has!