Other forms: economies of scale
When a business grows larger and its cost per product goes down, that's an economy of scale.
Economies of scale mean that it often makes financial sense for a company to expand. By investing in new factories, larger stores, more employees, or updated technology, a business can often cut down on the cost of the goods it produces or sells. If it's less expensive to buy a book from a giant online retailer than at your neighborhood bookstore, it's probably because of an economy of scale.