Reading

Practical perspectives for running multiple marketplaces

Inventory, returns, and real profit — the points that get harder to see the more marketplaces you sell on.

2026-07-29

Why Selling Across Rakuten, ZOZOTOWN, and Shopify Causes Overselling and Lost Sales at the Same Time

Selling on Rakuten, ZOZOTOWN, and your own Shopify store at the same time tends to produce two problems at once: overselling and lost sales from phantom stockouts. Both come from the same root cause, and the fix starts with viewing inventory across marketplaces, broken down by size and color.

Read more →
2026-07-29

Why Comparing Revenue Alone Across Marketplaces Can Mislead You About Which One Is Actually Profitable

The marketplace with the highest revenue isn't necessarily the most profitable one. This article explains why you need to compare real profitability — after fees, ad spend, and return rates — rather than revenue alone.

Read more →
2026-07-29

Which Marketplace Should Get More Ad Spend? Why Revenue Alone Can't Answer That

When you're splitting ad spend across marketplaces like Rakuten, Amazon, and Yahoo! Shopping, deciding where to concentrate the budget can end up being a gut call. This article explains why you need to compare ad performance across marketplaces, not just revenue.

Read more →
2026-07-29

Common Mistakes Companies Make When Aggregating Multi-Marketplace CSVs by Hand Every Week

This article breaks down the mistakes that commonly occur — and their root cause — in operations that export CSVs from Rakuten, Amazon, ZOZOTOWN, and a self-run store, then aggregate them by hand in Excel.

Read more →
2026-07-29

Same Shipping Threshold, Different Real Cost: How Delivery Economics Vary by Marketplace

Even when you set the same free-shipping threshold across marketplaces, the real delivery cost you carry differs by channel. Here's how average order value, bundling rates, and return-shipping rules drive that gap.

Read more →
2026-07-29

The Real Cost of Keeping Your Multi-Marketplace Numbers in Excel

Manual aggregation in Excel looks free, but it quietly charges you in two currencies: staff hours and slower decisions. Here's what that cost actually looks like.

Read more →
2026-07-29

Why EC Sellers Without a Standard Weekly Report Format End Up Making Slower Decisions

Reporting sales weekly doesn't help much if the format changes every time. Without a standard structure, every report has to be re-interpreted from scratch, and decisions slow down as a result.

Read more →
2026-07-29

Getting a Dashboard Adopted Company-Wide Takes More Than Just Building It

It's common for a dashboard to get heavy use right after launch, only for everyone to quietly stop opening it within a few weeks. Here's the operating design needed to make adoption stick.

Read more →
2026-07-29

The First Step Toward Data-Driven Management for EC Sellers

For EC sellers who keep hearing the phrase "data-driven management" but aren't sure where to start, here's a realistic first step.

Read more →
2026-07-29

What's the Difference Between an Order Management System and a BI Dashboard?

It's easy to assume that having an order management system in place means your numbers are already visible — but these are tools built for different purposes. Here's how their roles differ.

Read more →
2026-07-29

How Do Fee Structures Differ Across Rakuten, Amazon, ZOZOTOWN, and Yahoo! Shopping?

Rakuten, Amazon, ZOZOTOWN, and Yahoo! Shopping each have very different fee structures. This article organizes the differences based on published information, and states plainly where information isn't publicly available.

Read more →
2026-07-29

Yahoo! Shopping Has No Store-Opening Fee — So Why Do Margins Tend to Shrink?

Yahoo! Shopping waives its initial setup fee, monthly usage fee, and revenue royalty, but there are several mandatory costs, including point funding and affiliate compensation. Here's a breakdown based on official information.

Read more →
2026-07-29

Your Own Store (Shopify) vs. Marketplaces: The Data You Can Actually See Is Different

Shopify and marketplace channels both report "sales data," but the level of detail you can actually see differs. Here's why marketplaces structurally limit what they expose.

Read more →
2026-07-29

Multi-Marketplace Data Analysis: Should You Build It In-House or Outsource It?

Should you build your multi-marketplace data analysis capability in-house, or hand it to an outside partner? A look at the tradeoffs of each approach and where the decision actually turns.

Read more →
2026-07-29

Inventory and Pricing Checklist to Complete Before Rakuten Super Sale

Rakuten Super Sale runs four times a year, each event lasting roughly eight days. Here are the inventory and pricing checkpoints that multi-marketplace sellers should confirm beforehand.

Read more →
2026-07-29

Preventing Stockouts Across Multiple Marketplaces During Black Friday and Year-End Sales

Black Friday and year-end sales run on different schedules across marketplaces, and those sale periods have been getting longer year over year. Here are the points multi-marketplace sellers need to watch to avoid stockouts.

Read more →
2026-07-29

What Happens When SKU Registration Timing Slips Across Marketplaces for a New Product Launch

You plan to launch a new product on multiple marketplaces at the same time, but SKU registration timing can end up out of sync from one marketplace to another. Here's what that causes.

Read more →