Retailers frequently add an item to a purchase rather than reducing the price by the equivalent amount. The added item usually costs the seller less and does less harm to the price structure.

The gift is valued at retail, not at cost

A shopper values an included item at roughly what it would cost to buy, while the seller gives up only what it cost to acquire, which is considerably less.

That gap means a promotion can appear larger to the shopper than it is to the accounts. A price cut has no such gap, since money reduced is money forgone at face value.

The wider the margin on the added item, the more efficient the mechanism becomes. It works best when the gift is something the seller produces or buys at scale.

Discounts damage the reference price

Repeated price cuts teach shoppers a lower normal price, and the previous figure stops functioning as the reference against which value is judged.

An added item leaves the headline price untouched. The promotion can run, end and run again without the underlying price ever being seen at a reduced level.

This matters most for goods sold across many retailers, where a reduction at one seller is quickly visible everywhere and becomes difficult to reverse.

Gifts move stock that would otherwise sit

The item given away is often chosen because it is overstocked, approaching the end of a season, or a version being replaced by a newer one.

Distributing that stock through a promotion clears it without a public markdown, which would signal to the market that the item had failed to sell at its intended price.

The gift also introduces shoppers to a product they had not chosen, occasionally converting them into buyers of it later. That secondary effect is part of the calculation.

Zero has a disproportionate pull

Something offered at no cost is evaluated differently from something offered cheaply. The absence of a price removes the trade-off that a small charge would introduce.

A nominal charge for the same item produces a markedly weaker response, because the shopper begins comparing its worth against its cost rather than simply accepting it.

This is why sellers rarely price an add-on at a token amount. Either it is included or it is a separate purchase, and the middle ground performs poorly.

Judging the offer means pricing the gift

The useful question is what the added item would be worth if bought separately, and whether it would have been bought at all.

An item that would never have been purchased has little value to the shopper regardless of its ticket price, which makes the promotion cheaper for the seller than it appears.

Comparing the total outlay against a straightforward reduction elsewhere is the only way to settle it, and that comparison frequently favours the reduction.