The Psychology of Change - Rounding, Disappearing Coins, and How Cashless Payments Are Ending Small Change

Japan's 1-yen coin (made of aluminum, weighing 1 gram) costs approximately 3 yen to produce. A coin that costs three times its face value to manufacture is, by its very existence, economically irrational.

The 1-yen coin isn't alone. The 5-yen coin costs about 7 yen to produce, and the 10-yen coin costs roughly 10 yen. Their face values barely match or fall short of production costs. Coins only become "profitable" to mint starting at the 50-yen denomination.

The reason the 1-yen coin hasn't been abolished is that it's needed for consumption tax calculations. As long as tax-inclusive prices generate amounts down to the single yen, cash transactions can't function without 1-yen coins. However, as cashless payments become more widespread, the need for physical 1-yen coins diminishes.

In fact, the Bank of Japan has significantly reduced the number of 1-yen coins minted since fiscal year 2022. Circulation is on a downward trend, and "the day the 1-yen coin disappears" is becoming increasingly plausible. Search "チョーカー" on Amazon

Several countries have already eliminated their smallest coins.

Canada. In 2013, Canada stopped producing the 1-cent coin (penny). Cash transactions are rounded to the nearest 5 cents. A $1.02 item rounds down to $1.00; a $1.03 item rounds up to $1.05. Electronic payments continue to be settled to the cent.

Australia. In 1992, Australia abolished its 1-cent and 2-cent coins. Cash transactions are rounded to the nearest 5 cents.

Sweden. In cashless-leading Sweden, the 50-ore coin (the smallest denomination) was abolished in 2010. Since cash transactions have virtually disappeared, the coin's elimination caused no social disruption.

The experience of these countries shows that the impact of eliminating small coins is "essentially zero." The gains and losses from rounding nearly cancel out over time. While some worry about "losing money from rounding up," statistically, rounding up and rounding down occur in roughly equal measure, making the net effect negligible.

Saying "keep the change" at a taxi or cafe is a form of tipping culture. Japan is said to have no tipping custom, yet a de facto tip occurs routinely whenever someone forgoes their small change.

If you pay 1,000 yen for a 980-yen purchase and say "keep the change," you've effectively given a 20-yen tip. That 20 yen represents a trade-off between the hassle of receiving change (the time spent putting coins in your wallet) and the value of 20 yen. For most people, a smooth exit is worth more than 20 yen in coins.

With cashless payments, this "leftover change" vanishes entirely. Pay 980 yen with PayPay, and exactly 980 yen is deducted. The concept of change itself disappears, along with the small tipping opportunity that "keep the change" provided.

On the other hand, cashless payments have spawned alternatives to the traditional change jar. Some services automatically round up your payment and transfer the difference to a savings account. A 980-yen payment gets rounded to 1,000 yen, and the 20-yen difference goes into savings - a digital-age version of the coin jar.

The "980 yen" pricing strategy discussed in the psychology of pricing also has implications from a change perspective.

Buy a 980-yen item with a 1,000-yen bill, and your change is 20 yen - just one or two coins. Buy a 1,000-yen item, and there's no change at all. For consumers, fewer coins to handle means less friction.

But as cashless payments become the norm, the hassle of handling change disappears. The psychological effect of odd pricing (the left-digit effect) persists, but the secondary benefit of convenient change is lost.

Some research suggests that in countries with high cashless adoption, the effectiveness of odd pricing is weakening. When comparing "980 yen" and "1,000 yen" on a digital screen without the physical sensation of receiving change, only the left-digit effect remains. In the future, the very approach to odd pricing may need to evolve.

During this transitional period before coins disappear entirely, here are some smart ways to handle small change.

Prioritize cashless payments. The most effective way to reduce coin accumulation is to avoid generating change in the first place. Pay with PayPay or a transit IC card, and the change problem simply doesn't arise. You also earn reward points - two birds with one stone.

Make coin saving a habit. Regularly drop the coins from your wallet into a jar. Over a year, this typically adds up to several thousand to around 10,000 yen. Be mindful of bank coin deposit fees (charged based on the number of coins) and deposit at an ATM once you've accumulated a reasonable amount.

Use self-checkout to offload coins. Self-checkout machines at supermarkets and convenience stores won't give you a dirty look for dumping in a pile of coins. It's your chance to empty your wallet of small change.

Convert coins to e-money. Some charging machines accept coins. Converting small change to e-money lets you spend it down to the last yen without any leftover fractions.