What innovation made it possible to sell a lot of goods really cheap?

The innovation that significantly enabled the sale of goods at lower prices is the development of large-scale manufacturing and automation, particularly during the Industrial Revolution. This allowed companies to mass-produce items efficiently, reducing production costs. Additionally, advancements in logistics and supply chain management, such as just-in-time inventory and global shipping, further lowered prices by streamlining distribution. Together, these innovations made it feasible for retailers to offer a wide range of products at competitive prices.