ROI (Return on Investment)

Amazon & D2C glossary · Harpy Media

ROI (Return on Investment) is gain divided by cost, expressed as a percentage: what a rupee or dollar of investment returned. It is the master ratio that every other metric in the business ultimately serves, and on a marketplace it is most useful at the level of the unit and the SKU.

What is ROI?

ROI (Return on Investment) is gain divided by cost, expressed as a percentage: what a rupee or dollar of investment returned. It is the master ratio that every other metric in the business ultimately serves, and on a marketplace it is most useful at the level of the unit and the SKU.

Its virtue is comparability. Advertising, inventory, a listing redesign, and a new launch can all be measured in the same terms once the ratio is applied honestly — which makes it the tool that decides where the next unit of cash actually goes.

The mistake that makes ROI useless

Most bad ROI calculations come from an incomplete denominator. Sourcing cost alone looks wonderful because it ignores shipping, duty, platform fees, advertising, and returns. Calculate against manufacturing cost and a product appears to return five hundred percent; calculate against the fully loaded cost and the same product returns a fraction of that.

Which is why the number to use is fully loaded: landed product cost, fees, advertising allocation, and the cost of returns. It is a less flattering figure and a far more useful one, because it is the number that determines whether the business has cash after the sale rather than merely revenue during it.

Using ROI to allocate cash

At unit level it tells you which products deserve more working capital, and it is directly comparable across a catalogue once everyone is measured on the same basis. A product returning strongly on fully loaded cost should receive the next purchase order; one returning poorly needs repricing, cost work, or removal from the range.

At decision level it turns projects into arithmetic. A packaging change that reduces returns, a listing rebuild that lifts conversion, an advertising push — each has a cost and an expected gain, and the comparison between them is what stops the loudest idea from getting the budget. Applied consistently, ROI stops being a reporting metric and becomes the routing rule for the whole business.

In practice

A seller sources an item at four, pays two in shipping to land it at six, incurs eight in platform and fulfilment fees, and spends three per unit on advertising — a fully loaded cost of seventeen. Selling at twenty-five leaves eight of profit: an ROI of roughly 47% on the true investment, which is the figure the pricing and reorder decisions are made against.

How Harpy Media helps

Unit economics and capital allocation are central to our work: ROI calculated on fully loaded cost, products ranked by true return, and investment decisions routed by that ranking rather than by revenue.

ROI FAQ

What is a good ROI on Amazon?

It depends on the product, price point, and category, but the meaningful test is consistency: a product should return a healthy margin on its fully loaded cost after advertising and returns, not just on its manufacturing cost.

Why is my ROI different from my profit margin?

They measure related things from different angles: margin is profit as a share of revenue, ROI is profit against the money invested to generate it. A low-priced product can have a modest margin percentage but an excellent return on the capital it ties up.

What costs go into the ROI calculation?

Everything consumed by the sale: landed product cost (including freight and duty), referral and fulfilment fees, advertising allocation, and the expected cost of returns. Excluding any of them overstates the return.