Why Prices End in 99

The psychology and evidence behind charm pricing, and why a price of 9.99 can feel much cheaper than 10.

Walk through almost any shop and you will see prices like 9.99, 499 or 1,999. Why not round numbers? The practice is called charm pricing, and there is evidence that it works.

The left-digit effect

People tend to read numbers from left to right and pay most attention to the first digit. A price of 3.99 starts with a 3, so it can feel closer to 3 than to 4. This is called the left-digit effect.

Research supports it. A study by Nicola Lacetera, Devin Pope and Justin Sydnor of millions of used car sales found that cars sold for noticeably less when their mileage reading had just crossed a round number, like 10,000 miles, than cars with slightly lower mileage, such as 9,990 miles. Buyers focused on the left digit rather than the full number.

Other explanations

Signalling a bargain: prices ending in 9 are often associated with discounts, so they may suggest a good deal.
History: some accounts suggest odd prices once forced cashiers to give change, making it harder to pocket money without ringing up the sale, though this is hard to verify.

Round prices for luxury

Interestingly, luxury and high-end businesses often use round numbers, like 200 rather than 199. Round prices can signal quality and simplicity rather than bargains. Upscale restaurants sometimes list prices without currency symbols or decimals for the same reason.

Two price tags

A pair of shoes costs 2,000 rupees. The shop changes the tag to 1,999 rupees. The actual saving is one rupee, but many shoppers perceive it as a price in the one-thousands rather than two thousand. Research suggests this small change can increase sales, which is why it is so common.

Being aware

Knowing about the left-digit effect can help shoppers focus on the full price. Rounding prices up mentally, treating 9.99 as 10, gives a more accurate sense of what you are spending.

Thinking a few paise or cents don't matter to sellers

To a single shopper, the difference between 10 and 9.99 is trivial. But across millions of sales, the extra purchases caused by charm pricing can add up to large revenues, which is why businesses use it so widely.

Key takeaways

Charm pricing uses prices ending in 9 or 99.
The left-digit effect makes 3.99 feel closer to 3 than to 4.
Research on used cars found buyers focus on left digits when judging value.
Luxury sellers often prefer round prices to signal quality.