I didn't read the article, but economies of scale are an ongoing part of my business model.
For example, when I went into business two years ago, I paid more for just about everything. My prices and my profits were based on those numbers. As I have found alternatives over time, My profit margin has increased with no real changes in the way I do business.
When I did the business plan for my retail store, I based costs and profit on my current expenses and knew that I was happy with the numbers as they were. Today I met with a restaurant wholesaler and he gave me my new wholesale proces on the same premium ingredients that I now use with a savings of about 35%. That savings is pure profit, as it directly relates to the cost of my ingredients.
The idea of economies of scale is to cut costs, not through cheaper products, but through a lower cost on the same quality.
Another example is my rent on the retail space. I could just have a bakery, as this alone will justify the rent, but I wasn't satisfied with that. Out of the same space, three separate businesses will be run, each with the ability to justify all expenses and rent alone. So by upping the output of the square footage, two of the three businesses are essentially pure profit less direct expenses of the product.
Another example would be cost structure on high volume orders. My corporate accounts send cupcakes to many clients in one order. I give a small discount, but because of the high volume of only one product, my overall profit is up because the labor expense is down.
Economies of scale is a path to pure profit because it involves you doing the exact same thing at a lower cost.