How do external economies of scale benefit all firms within an industry?

External economies of scale benefit all firms within an industry primarily through factors that decrease average production costs. This occurs when the industry as a whole expands, leading to benefits that individual firms may not be able to achieve on their own.

As more firms enter an industry, there are often improvements in infrastructure, specialized suppliers emerge, or a skilled workforce is developed, which reduces costs for all businesses operating within that industry. For example, if a cluster of firms in a particular industry develops in a specific location, the creation of networks and local suppliers can lead to savings in transportation costs and inputs, ultimately allowing firms to produce at lower average costs.

In contrast, operational costs are not imposed on firms by these economies. While reduced competition might seem beneficial for individual firms, it doesn't directly relate to the benefits of external economies of scale. Access to raw materials can be a benefit as well, but it’s the overall reduction in production costs that encapsulates the broader impact of external economies of scale on all firms in the industry.