MarketingDUAL-USE

Charm Pricing

What it is

Ending prices in 9 or 99 — $9.99 rather than $10 — so that the leftmost digit, which people weight most heavily, reads one lower than the price actually is.

How it works

People read numbers from the left and stop early. Thomas and Morwitz called it the left-digit effect: $3.99 is encoded as “three-something” and feels farther from $4.00 than the cent that separates them, while $3.90 versus $3.99 shows no such gap. The effect appears when the leftmost digit changes and largely disappears when it does not, which is why 99-endings cluster just below round numbers. Field evidence is strong. Schindler and Kibarian mailed catalogue prices ending in 99, 88, and 00 and found the 99-endings sold more; Anderson and Simester found that a $39 price outsold both $34 and $44 in catalogue experiments, meaning the ending raised demand more than a lower price did. A second mechanism rides alongside: 9-endings have become a learned signal of “discount” or “sale”, so the price also implies a bargain that may not exist. The effect is not confined to shopping: Lacetera, Pope and Sydnor found used-car prices drop discontinuously each time the odometer crosses a 10,000-mile mark, because buyers read the leftmost digit of mileage the same way. The origin stories — cash registers, penny newspapers — are unverified; the psychology is not.

Real-world examples

  • •Anderson and Simester's catalogue experiments (2003): a dress priced at $39 outsold the same dress at $34 and $44.
  • •Used-car markets: Lacetera, Pope and Sydnor (2012) found prices fall sharply at each 10,000-mile odometer threshold, a left-digit effect in a market of experienced buyers and dealers.
  • •App stores and digital media: the $0.99 song and the $4.99 app, price points chosen to sit just under the first digit that would register.
  • •Fuel priced to the ninth of a cent in the United States — $3.499 displayed as $3.49 — the left-digit effect applied at the tenth of a cent for a century.

Ethical guidelines

Where the line is

A 9-ending on a price that is the full price paid is an accepted convention the buyer can correct with a moment of rounding; it becomes manipulation when the ending is used to fake a discount signal, when the cents are visually shrunk so the dollar figure reads as the price, or when the anchor is set just under a threshold and fees are added afterwards.

  • ●The price shown must be the price paid: a 9-ending is a convention, not a deception, so long as no fees, taxes, or drips are added after the anchor lands.
  • ●Do not use 9-endings to imply a discount that does not exist; a “sale” signal without a real reference price is a false claim.
  • ●Show the cents at the same size as the dollars; shrinking the “.99” to make “$9” read as the price is misdirection, not charm.
  • ●Unit prices at the shelf edge let customers compare across endings; keep them accurate and visible.

How to defend against it

  • ►Round up, always: read $9.99 as $10, $3.499 as $3.50, $19,995 as $20,000, and add the total in round numbers before deciding.
  • ►Compare on unit price rather than shelf price, which strips the ending out of the comparison entirely.
  • ►Treat a 9-ending as a neutral convention rather than a sale signal; check whether the item is actually discounted with a price-history tool before treating it as a bargain.
  • ►For large purchases where the left digit is doing the work — cars, houses, salaries — write out the full number and the difference from the round figure in words, which restores the cents to their real size.

From the Defense Playbook

The Unit-Price Checkseconds

Compare products by price per unit (per 100 grams, per litre, per sheet, per dose) instead of by pack price, pack size, or the size of the discount sticker, which is the one number that package design and promotions cannot disguise.

Every playbook entry states how strong its evidence is and when not to use it. Browse the full playbook.

References

  1. Thomas, M., & Morwitz, V. (2005). Penny Wise and Pound Foolish: The Left-Digit Effect in Price Cognition. Journal of Consumer Research, 32(1), 54-64
    The left-digit effect: 9-endings lower perceived price only when they change the leftmost digit.
  2. Schindler, R. M., & Kibarian, T. M. (1996). Increased Consumer Sales Response Though Use of 99-Ending Prices. Journal of Retailing, 72(2), 187-199
    The field experiment showing higher sales for 99-ending prices than for 00-ending prices.
  3. Anderson, E. T., & Simester, D. I. (2003). Effects of $9 Price Endings on Retail Sales: Evidence from Field Experiments. Quantitative Marketing and Economics, 1(1), 93-110
    Catalogue experiments in which a $39 price outsold both $34 and $44.
  4. Lacetera, N., Pope, D. G., & Sydnor, J. R. (2012). Heuristic Thinking and Limited Attention in the Car Market. American Economic Review, 102(5), 2206-2236
    Discontinuous drops in used-car prices at 10,000-mile odometer thresholds — the left-digit effect outside retail.
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