The successor announcement is the event that moves the old price

Everything here earned its place by changing an outcome. Nothing about model replacement cycles is included to round the number up.

Why the announcement matters more than the launch

The moment a replacement is announced, demand for the outgoing model drops even though the product itself is exactly what it was the day before. Retailers holding stock now face an asset losing value, and the rational response is to move it before the successor arrives on the shelf beside it. That is why the sharpest reductions on outgoing models often come between announcement and availability rather than after.

By the time the new model is actually on sale, much of the old stock has already been cleared and the bargains have thinned. The calendar that matters is the announcement calendar, not the shipping one.

What the reduction depends on

Depth is set mainly by how much old stock exists, which is why a model that sold well leaves fewer bargains behind it. A category with long production lead times tends to leave more overhang, because orders were placed before the successor was public. Where the successor is a large change, the old model falls harder; where it is a minor revision, buyers are indifferent and the fall is shallow.

Retailers with limited storage move faster than those with warehouse space, so the same model can be cleared at different speeds by different sellers. None of these produce a predictable percentage, but together they explain why two similar situations look nothing alike.

Cycles you can actually observe

Many categories run on a broadly annual or biennial refresh, and the pattern is usually visible in the history of past model numbers. Trade shows and industry calendars concentrate announcements into particular parts of the year for whole categories at once. Where a category has a firm annual cadence, the outgoing model becomes cheap on a schedule you can anticipate a year ahead.

Per unit, where the cadence is irregular, waiting becomes a guess and the cost of waiting is real. Checking when the current model was released is a two-minute exercise that tells you roughly where in the cycle you are standing.

What you actually lose by buying the old one

Whether the successor is meaningfully better is a product question, and this is not the place to answer it. What can be said about price is that the outgoing model has a shorter remaining support window and a shorter accessory availability window.

Resale value, where a category has one, typically steps down at the moment of announcement rather than gradually. For anything you intend to keep until it fails, those considerations matter much less than they do for anything you intend to replace. The trade is a real one and it is about time rather than about quality.

Buying into the gap deliberately

If you know a refresh is near, deciding in advance whether you want the old price or the new features removes the temptation to dither into paying full price for either. The worst outcome is buying the outgoing model at the old price shortly before the announcement, which is entirely avoidable with one check.

Setting an alert on the outgoing model before an expected announcement catches the first movement rather than the last of the stock. For gifts and other date-bound purchases, the announcement calendar deserves as much attention as the delivery calendar. A cycle is one of the few genuinely predictable things in pricing and it costs nothing to look up.

Retailers vary discounting by region and by account, so the price on your screen may differ from any quoted here.

When the cycle does not help

Categories without model years, such as basic tools or household staples, have no successor mechanism at all and their prices move for other reasons. Fast-moving fashion runs on seasons rather than versions, so the equivalent event is the end of a season rather than a launch.

Across a sale weekend, some products are refreshed silently with no announcement, in which case the only signal is a changed part number. Applying model-cycle thinking to a category that has no cycle produces waiting with no payoff at the end of it. Establish that a cycle exists before you plan around one.

Everything above, in order of what to do first

1. Why the announcement matters more than the launch. The moment a replacement is announced, demand for the outgoing model drops even though the product itself is exactly what it was the day before.
2. What the reduction depends on. Depth is set mainly by how much old stock exists, which is why a model that sold well leaves fewer bargains behind it.
3. Cycles you can actually observe. Many categories run on a broadly annual or biennial refresh, and the pattern is usually visible in the history of past model numbers.
4. What you actually lose by buying the old one. Whether the successor is meaningfully better is a product question, and this is not the place to answer it.
5. Buying into the gap deliberately. If you know a refresh is near, deciding in advance whether you want the old price or the new features removes the temptation to dither into paying full price for either.
6. When the cycle does not help. Categories without model years, such as basic tools or household staples, have no successor mechanism at all and their prices move for other reasons.

The takeaway

Look up when the current model launched before you buy, because the announcement calendar moves prices more than the sales calendar does.

A discount is a claim about a price you were never asked to pay.