An online retailer can sell hundreds of products, report impressive revenue growth, and still struggle financially. The problem is often not a lack of customers, but the capital tied up in inventory before those customers arrive. Slow-moving stock creates storage costs, restricts cash flow, and eventually forces discounts that can eliminate the savings of bulk production.
The scale of the opportunity makes this an increasingly important issue. Census Bureau, American retail e-commerce sales reached $1.23 trillion in 2025, increasing 5.4 percent from the previous year. Online transactions accounted for 16.4 percent of total retail sales.
Independent merchants are capturing a substantial share of this activity. Amazon's 2025 Small Business Empowerment Report states that more than 75,000 independent sellers exceeded $1 million in annual marketplace sales. Yet revenue alone reveals little about profitability or how efficiently businesses manage their capital.
After more than nine years working across e-commerce, wholesale, and product development, I have come to view inventory management as one of the most consequential decisions an online business makes. Sellers must determine which products justify holding stock and which should only be manufactured after a customer places an order. Print on demand offers greater flexibility, particularly for apparel, accessories, and personalized merchandise.
The decision, however, must be guided by actual demand, its consistency, and the capital a business can afford to commit. One common mistake in product selection is confusing strong sales with dependable demand. A product selling 500 units in a month may appear to justify a substantial inventory investment.
However, the calculation changes if most purchases occurred during a promotional campaign or seasonal surge. Monthly sales totals provide only part of the picture. Weekly orders, seasonal variations, repeat purchases, and sales across product variations offer better forecasting opportunities.
Extract — continue reading at the source.
