Amazon and Walmart Hit 51.6% of US Online Sales as Shipping Costs Spike

Amazon and Walmart crossed a historic threshold in 2026: together they captured 51.6 percent of all U.S. online sales, breaking the 50 percent mark for the first time. That number lands on small online sellers at the worst possible moment, because shipping costs have climbed sharply on the back of the U.S.-Iran conflict and the resulting global rise in diesel prices.

Those two forces combine into what e-commerce strategist James F. Richardson, PhD, founder of Premium Growth Solutions, calls an existential risk for independent sellers heading into the holidays. His core warning: rising shipping costs squeeze contribution margins hard enough to wipe out net profit entirely for online-only businesses that drop-ship at a low average order value — under $50 per order.

Why Q4 makes the squeeze worse

Thousands of online businesses depend on the fourth quarter to move a significant chunk of their annual sales. Richardson points to sellers ranging from specialty chocolatiers like Fran's Chocolate in Seattle to the thousands of Etsy merchants selling custom jewelry, apparel, and other artisan goods that dominate holiday gifting.

For these sellers, a price increase isn't optional when input costs jump. Yet every time an external event drives up costs, some small online sellers tell the press they're reluctant to raise prices. Richardson's verdict on that hesitation is blunt: "Sigh."

Who can afford to hold prices — and who can't

The founders most likely to freeze prices, Richardson argues, are artisan producers who feel closely connected to their top customers. Some feel guilty about passing along the pain. Many of them watch their balance sheet go red and wind down the business.

"Saving your customers' money is actually a luxury for a small business with limited access to capital," Richardson writes. "Holding prices is a superpower reserved for high-net-worth entrepreneurs and businesses operating profitably at scale."

His framing cuts against the gratitude reflex many founders carry. You may feel immensely grateful for your early customers, he concedes — especially in a B2B business like his own — "but these darling people are not your friends." If you go out of business tomorrow, they'll feel sad briefly, then find something else to buy.

The fad problem: even loyal buyers ghost

Richardson adds a harder truth for sellers in trend-driven categories. In fad-dense verticals like apparel, footwear, craft beer, and jewelry, today's most elite early customers will very likely move on as they discover the next cool thing — his phrase is that they'll "ghost you."

That churn risk compounds the margin math. A seller absorbing higher diesel-driven shipping surcharges to protect a loyal customer base that may not stay loyal anyway is taking the worst of both sides of the trade.

The dominance of Amazon and Walmart raises the bar further. As the two giants grow past 51.6 percent of U.S. e-commerce, small online players have to be smarter and more premium to build and keep any memorability with shoppers, Richardson writes.

What sellers should actually do

Richardson's bottom line for the holiday quarter is direct: small brands must raise prices when costs go up, and Q4 is already slipping away for sellers who wait. The businesses most exposed are the low-AOV drop-shippers, where each order's shipping cost eats a disproportionate share of a sub-$50 ticket.

The takeaway in plain words: holding prices is a strategy only scaled, profitable companies can afford — and waiting out the diesel spike could turn a thin-margin holiday season into the last one a small brand ever runs.