Price is the fastest profitability lever… and the easiest to ruin. These are the pricing mistakes that cost the most money on Amazon and MercadoLibre.

1. Setting the same price on every channel

Fees and costs differ per platform. A price that’s profitable on Amazon can put you in the red on MercadoLibre (or vice versa). Price must be computed per channel, starting from your target margin.

2. Entering price wars without knowing your floor

Dropping to win the Buy Box or climb the listing feels good until the margin is negative. You need to know your minimum profitable price per product before competing.

3. Ignoring fees when setting the price

Pricing on “cost + desired margin” without subtracting referral, FBA/Full, shipping and tax is the recipe for the fake winner: you sell a lot and earn little.

4. Not updating prices when costs change

Freight rises, a fee changes, the product gets pricier… and your price stays the same. Margin erodes in silence.

5. Discounts and promos without seeing the margin effect

An aggressive promo can be profitable or ruinous. The only way to know is to see the resulting net margin, not just the sales bump.

6. “Psychological” prices that break the margin

$499 looks better than $512, but if those $13 were your profit, the pretty price is costing you money. Aesthetics don’t make payroll.

The defense: real margin, always visible

Almost all of these mistakes disappear when you see, per product and channel, your minimum profitable price and current margin. With that floor clear, you price with judgment, not fear.

In short

Flat prices, blind wars, ignoring fees and not checking margin are the costliest mistakes. All are avoided with real per-channel margin visibility — exactly what iqseller delivers.

Want to price without losing margin? Join the beta waitlist.

Pricing mistakes that kill your profitability on marketplaces