When to Buy Used and When to Wait: Reading Depreciation

Most explanations of depreciation patterns in used goods stop at the point where it starts to matter. This one carries on.

The shape of the curve

Most manufactured goods lose value fastest immediately after purchase, then more slowly, then barely at all once they reach a residual working value. The steep early section is paid for by whoever buys new, which is the fundamental economic argument for buying used at all. The flat section is where an item's price reflects its remaining usefulness rather than its novelty, and that is the buying window.

Some categories eventually turn upward as scarcity develops, which is the vintage premium and applies to a small minority of goods. Knowing roughly where a category sits on this curve tells you whether to buy now, wait, or buy new.

Categories with brutal early depreciation

Consumer electronics lose a large share of value within a year, driven by release cycles rather than by any change in the item. Vehicles, furniture and appliances all show steep initial drops, in each case because the buyer pool for anything used is smaller than for new. Fashion follows seasons rather than years, with the largest drop occurring the moment the season ends regardless of whether the garment was worn.

In each of these, waiting a defined period after release produces a large saving on an essentially identical item. The waiting period differs by category and is usually obvious from watching listings for a few weeks.

Categories that barely depreciate

Hand tools, cast iron cookware, musical instruments of quality, and solid timber furniture all hold value because they neither wear out nor go out of date. For these the used discount is modest, which frustrates buyers and correctly reflects that the item has decades of life left.

In the annual accounts, buying used in these categories is still worthwhile, but the saving comes from patience and condition rather than from the curve. The same goods bought new and kept represent a genuinely low cost per year, which is the other way to think about the same fact. A small discount on something that lasts thirty years is worth more than a large discount on something that lasts three.

Predictable timing effects

New model releases in electronics push the previous generation down sharply within weeks, and the previous generation is usually barely different. Seasonal goods, including outdoor equipment, sports gear and clothing, drop hardest immediately after their season ends.

House moves cluster in certain months in most markets, which floods local listings with furniture priced for speed rather than value. The period after the winter holidays produces both a surge of donations and a surge of unwanted gifts on marketplaces.

None of this requires sophistication, only the willingness to buy at a time that is not the time you first wanted the item.

When new is the right answer

Where the used discount is small and a warranty is worth having, new can be the better purchase even to a committed second-hand buyer. Safety-critical items with unverifiable history belong here, as do items where the used market is thin enough to make comparison impossible.

Efficiency-critical appliances running continuously may cost more used once energy consumption is counted over remaining life. Buying new and keeping an item for its full life is also a legitimate answer, since durability matters more than acquisition route. The second-hand argument is about price and waste, not about a rule that new purchases are illegitimate.

Overhead ratios are a weak measure of a charity and a strong measure of its accounting.

Building the habit

Decide what you want, then set a price alert and wait, which is the entire method and works better than any amount of browsing. Track completed sales rather than asking prices, because the gap between them is large and varies by category.

Sorting the donation bags, buy at the point where the curve flattens, which for most electronics is one to two product generations after release. Accept the previous version rather than the current one as a default, since the difference is usually smaller than the price gap. The discipline is simply not buying at the moment of maximum desire, which is when everything is most expensive.

The takeaway

Wait for the flat part of the curve, and buy the version everybody stopped wanting last month.

Passed on beats recycled, and both beat replaced.