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The key to creating a factory-like operation is to standardize the items you sell. Instead of selling one thing today and a different thing tomorrow, sell the same thing day after day. Standardization enables a factory-like operation, which is the most efficient way to run your business.
When you standardize on selling items of the same type and size, you gain many efficiencies. For example, you can reuse the same product photos in all your listings, which means that you can cut back on the number of individual photo shoots you need to do. You can also reuse the same item descriptions in all your listings, which means reducing the time you have to devote to researching and writing item listings.