Definition
Economies of scale is the economic effect where the more goods or services you produce, the lower the average cost of making each one becomes. As a factory or production facility grows, the fixed costs paid up front get split across a huge number of products, so the cost per item falls and the business gains strong price competitiveness in the market.
Baking 1 Bungeoppang vs. Baking 1,000
Imagine making just one bungeoppang (a fish-shaped pastry filled with sweet red bean) at home. You have to buy a new mold and prepare the batter and the red bean paste, which costs more than 10,000 won and takes time. In that case, the cost of that one pastry is more than 10,000 won.
But if you use the same mold and heat to make 100 or 1,000, the story changes completely. The 10,000 won you spent on the mold gets spread evenly across hundreds or thousands of pastries, so the mold cost per pastry drops to a few dozen won, or even a few won.
This is how fixed costs, the money you must spend just to get started (like rent or buying machines, which are paid no matter how much you make), work. The more you make, the thinner the share each product has to carry.
In the end, the more you run the same machines and space without stopping, the more the average cost of making one item naturally falls toward the floor.
Three Powerful Weapons You Gain as You Grow
When a company gets bigger, powerful benefits show up one after another, beyond simply splitting fixed costs. The first is the big discount you get when you buy raw materials in bulk. A neighborhood bakery buying 1 bag of flour can't match the much lower unit price a large bakery factory can negotiate when it buys 10,000 bags at once.
The second is the division and specialization of work. If one person handles every step alone, from planning to assembly, packing, and delivery, it takes a lot of hands and mistakes pile up. But once the staff grows to hundreds and each person repeats their own task until they master it, speed and quality rise beyond comparison.
The third is the ability to boldly bring in expensive, cutting-edge automated machines. A factory making only 10 items a day can't afford a 1 billion won high-tech robot, but a large company turning out hundreds of thousands a day can install robots, cut the defect rate, and boost productivity explosively.
When all of these fit together, a large-scale company ends up with production costs so low that a small company can never catch up.
To Be More Precise: Does It Keep Getting Cheaper Forever?
So if you just keep building bigger factories and making more and more, can you make things almost for free? To be more precise, in reality you can't. Once production grows past a certain limit and gets too huge, the cost per product starts to rise again. This is called diseconomies of scale.
When a company grows too big, it ends up with tens of thousands of employees and endlessly complicated layers of reporting. Getting one approval takes days, communication between departments gets blocked, and needless management costs and waste swell out of control.
Also, as factories and sites multiply, the cost of moving materials and people back and forth rises, and so does the cost of supervising and coordinating each site.
In the end, successful companies focus less on stubbornly growing bigger and more on calculating exactly the best production scale, the one where the average cost is lowest.
Common misconceptions
Economies of scale happen automatically as long as you build a big factory and make a lot.
Even if you expand production facilities, if the goods don't sell and pile up in the warehouse, huge inventory costs and interest lead to a big loss instead. You only enjoy true economies of scale when mass sales keep pace with mass production.
Where you meet it
A big-box store can sell snacks cheaper than a neighborhood shop because it places orders of hundreds of thousands at a time nationwide, which pushes the unit price down.
A carmaker spends hundreds of billions of won on research and development to design a new car, then sells millions worldwide and recovers the development cost at a few tens of thousands of won per car.
In one sentence
The more you make, the more the fixed costs get split and the more efficient production becomes, so the average cost per item goes down.