Five countries, five ideas of a normal return, and why the number that sounds too good is different in every one of them.
If you ask a London saver what a good return on cash looks like, you’ll hear a number that starts with a 4. Ask a trader in Lagos and you’ll hear a number that would make the Londoner’s bank freeze the account and phone compliance. Both answers are correct. They’re just correct in different countries.
In some countries people chase yield to get richer, and in others they chase it to avoid getting poorer. Those are two different sports with different rules, and majority of the personal finance content online is written by people playing the first one and read by people stuck in the second.
During the formative years of human learning, yield gets taught as arithmetic: principal times rate times time, but in reality, people pick it up the way they pick up an accent. They learn it at home, from parents who trusted the bank or parents who trusted the mattress, from a rotating savings group at the market, from that adventurous cousin who doubled his money in a scheme that vanished the following Easter.
A lot of people carry an internal alarm tuned to their own country’s interest rate. Offer a saver in Tokyo 6% a year and you’re already offering twelve times what Japan’s biggest bank pays on deposits. Offer the same 6% in Lagos and it’s less than half the rate of inflation.
What sets the alarm is real yield: the return minus inflation. When it’s positive, yield is offence and cash is a safe bench. When it’s negative, yield is defence, and sitting still is how you lose.
The United States: offence by birthright
Americans grow up playing offence. Their savings sit in the world’s reserve currency, and the default retirement plan feeds paychecks straight into the stock market. The folklore number is 10% a year, close to the S&P 500’s long-run average, and it frames yield as something you grow into rather than something you cling to.
American cash sat on the bench for years paying almost nothing, and nobody panicked and that’s because inertia is affordable when your currency is the one everybody else measures against.
Americans expect a lot from markets, too. Individual investors surveyed in 2025 expected 12.6% a year above inflation, against the 7.1% their advisers called realistic. This inevitably leads to bad actors gaining advantage.
For example, Bernie Madoff never promised outrageous returns and one investor even said he was promised a steady 12% to 14% a year. The giveaway was the word “steady”. An analysis cited by the SEC’s inspector general found Madoff reported losses in only 4 of 139 months. When the fund collapsed in 2008, client statements showed about $64.8 billion that didn’t exist.
Washington’s response has been to draw lines around yield itself. The GENIUS Act, signed in July 2025, bars payment stablecoin issuers from paying interest to holders. In the US, yield on a dollar is treated as a banking privilege, and anyone else offering it gets audited first.
The United Kingdom: saving with a lottery ticket
British savers play careful offence.
Since 1956, NS&I has sold Premium Bonds, a government-backed savings product that pays no interest at all. Every bond enters a monthly prize draw instead. More than 20 million people hold them, and the pot is well over £100 billion.
Britons accept a random return, which in most months is zero, because the Treasury guarantees the capital. The UK alarm cares less about how big a yield is and more about who stands behind it.
In 2022 the game changed under them. Inflation reached 11.1% in October, a 41-year high. Millions of people who had never thought about real yield found themselves playing defence with offence equipment. In 2023 the FCA found the largest providers had passed on just 28% of rate rises to easy-access savers. A year later it counted £252 billion in accounts paying nothing at all.
The Bank of England’s climb to 5.25% by August 2023 flipped the game back, and savers rushed into fixed-rate bonds and cash ISAs paying 5% and above. When cash beats inflation, Brits would rather sit in it than touch the stock market.
The Treasury has noticed. In the November 2025 Budget, it announced the cash ISA allowance would drop from £20,000 to £12,000 for most savers from April 2027, an open attempt to move the country off the bench and onto the pitch with equities.
Brazil: grading yield as a percentage of a percentage
Brazil is where offence and defence happen in the same wallet.
Brazilians speak a yield language nobody else does. Just ask about a savings product and the answer will always come back as “100% of CDI” or “110% of CDI.” The CDI is an interbank rate that tracks the central bank’s Selic, and nearly every fixed-income product in the country is priced against it. Fintech apps advertise savings pots paying 100% of CDI the way American banks once advertised free toasters.
On offence, Brazilians have one of the best risk-free deals in the world. The central bank raised the Selic rate to 15% in June 2025 while inflation ran between 4% and 5%. The inflation-linked Tesouro IPCA+ bond, sold on the Treasury’s retail platform, spent much of 2025 paying inflation plus more than 7% a year, a real yield that would make a British saver call the regulator.
However, on defence, Brazilians carry a memory no rate can erase. Inflation passed 2,000% in 1993 before the Plano Real stabilised the currency in 1994. Anyone over forty remembers supermarket staff relabelling prices during the day, which is why Brazilians will rather hold dollars even when reais pay double digits.
When a mid-sized lender offers 130% or 140% of CDI, experienced Brazilian savers ask why it needs the money so badly. Banco Master answered that question in November 2025. The bank had sold certificates of deposit well above CDI, pitched as safe because the FGC deposit guarantee covers up to R$250,000 per person per institution. The central bank liquidated it, and the FGC faced the largest payout in its history.
Savers under the limit got their money back, but the guarantee only moved the bill to someone else. The yield was exactly as risky as it looked.
The dollar habit has now moved onchain. Central bank officials have said around 90% of the country’s crypto flows involve stablecoins. A Brazilian can earn 14% in reais on one screen and hold dollar tokens on the next. One is offence in the home currency. The other is defence against it.
Japan: defence by doing nothing
Japan played defence for thirty years without lifting a finger. Prices fell or stood still through most of that stretch, so cash quietly gained purchasing power. A bank account paying 0.001% was a winning strategy.
Then the Bank of Japan pushed rates below zero, from 2016 until March 2024. You’d expect savers to flee. In fact, they did the opposite.
As at March 2026, 47.2% of Japanese household financial assets sat in currency and deposits. The US figure was 10.7%.
To be fair though, some of the cash never reached a bank at all: economists estimate tens of trillions of yen are stored at home as tansu yokin, “dresser savings.”
This habit has broadly shaped what a suspicious return looks like. Japan Life promised about 6% a year and took roughly ¥210 billion from about 10,000 people, most of them over 70, before it collapsed in 2017.
MRI International sold “guaranteed” US medical receivables at 6% to 8.5%. Regulators later found it was paying clients with other clients’ money. Where the bank paid 0.001%, 6% didn’t sound like fraud. It sounded like a reward for being sensible.
NISA, the tax-free investment account, passed 30 million accounts by mid-2026, and scammers followed the new money. Police counted ¥128.8 billion lost to social-media investment scams in 2025, up 48% in a year.
In Japan, the regulator’s advice is short: when a “tasty investment story” arrives, don’t jump at it.
Nigeria: where the savings rate loses to the price of bread
Nigerian savers don’t get to choose the game.
Inflation peaked near 35% at the end of 2024 and was still in the high teens after the index was rebased in 2025. The central bank’s policy rate sat around 27%, and savings accounts are pegged to a floor of 30% of that, roughly 8%. A saver with a regulated bank account loses purchasing power every year by design.
Then the currency piles on. A dollar cost about ₦460 in early 2023 and more than ₦1,500 after the float. Treasury bills paying around 20% look like offence in naira terms, yet anyone holding naira across that stretch lost about two thirds of their dollar value.
Wealthier savers buy those bills anyway. Everyone else builds defence from whatever is available. Savings circles (Ajo) pay no interest but enforce discipline among people who see each other every week. Land gets bought as a savings account, because land doesn’t devalue on a Tuesday afternoon. Dollar domiciliary accounts and USDT bought peer-to-peer handle the currency side, and Nigeria sits near the top of Chainalysis’s global crypto adoption index year after year.
In reality, permanent defence wears people down and predators know it.
MMM Nigeria promised around 30% a month and froze withdrawals in 2016, leaving about 3 million people with losses the deposit insurer put at ₦18 billion. CBEX promised 100% in 30 days from “AI trading” and shut in April 2025. On Nairaland, one commenter put the believable ceiling at 4% a month. That’s roughly 60% a year, offered as the cautious number.
The Nigerian alarm has been recalibrated by an economy where the official baseline is itself extreme. This makes the question of where yield comes from more important in Lagos than anywhere else on this list.
The rate is the least useful number in the room
Put the five countries we’ve considered side by side and no single number survives the comparison. 0.001% was a decent deal in Tokyo. 20% is a loss in Lagos. Any article telling you “good yield is X%” is writing for one country and pretending it’s all of them.
What does travel though, is a set of questions, starting with what the yield is measured against. For anyone earning in dollars, stablecoin holders included, that reference point is the US Treasury bill rate. Every dollar yield on earth is quietly benchmarked against it, whether the advert admits it or not. Anything far above it is taking risk somewhere, and your job is to find out where.
Then ask who pays. Yield always has a payer: a borrower, a government, traders paying fees, a network paying validators. When none of those can be named, the payer is usually the next depositor. That is the structural difference between Premium Bonds and MMM, and between a deposit at 100% of CDI and one at 140%.
Then ask whether the yield can be checked or only told. Madoff’s steady returns lived on printed statements that nobody receiving them could verify. Onchain finance changes this: when a yield-bearing token’s share price is recorded onchain, anyone can watch it grow or stall, block by block. The headline APY is a claim. The share price history is a measurement. Newcomers should learn to skim the first and read the second.
Finally, look at how smooth it is. A return line with no bumps deserves more suspicion than one with a few.
Normal doesn’t cross borders
A Nigerian who laughs at a 4% dollar yield and a Brit who reports a 15% one to the FCA are running the same instinct on different economies. Both are answering the question “is this number normal?” and normal is local. It doesn’t survive a border or a currency float, and it definitely doesn’t survive a WhatsApp forward.
The better question works in every country and in either game: can you see where this yield comes from, and can you check it yourself? If you can’t, the rate is a story with a percentage sign on the end.
Sources:
All figures were checked between 27 and 28 October 2026.
1. Bank of Japan, policy rate decision, 18 September 2026
2. Bank of Japan, Flow of Funds: Overview of Japan, US and the Euro Area, data at end-March 2026
3. MUFG Bank, yen deposit rate notice, 18 September 2026
4. UPI, megabank deposit rates before the 2024 exit, June 2026
5. Japan Times, Japan Life collapse, December 2017
6. Japan Times, Japan Life arrests, September 2020
7. Securities and Exchange Surveillance Commission, MRI International, April 2013
8. Financial Services Agency, NISA statistics, end-June 2026
9. City AM, London Capital & Finance, March 2019
10. HM Treasury written statement on London Capital & Finance, April 2021
11. Financial Conduct Authority, Consumer Investments Strategy, September 2021
12. City of London Police, investment fraud losses in 2025, April 2026
13. Bank of England, Bank Rate
14. Office for National Statistics, consumer price inflation, September 2026
15. Hargreaves Lansdown, savings rate research, August 2026
16. Moneyfacts, inflation-beating savings deals, October 2026
17. Central Bank of Nigeria, MPC decisions, September 2026
18. Voice of Nigeria, September 2026 inflation from the NBS
19. TheCable, CBN savings deposit rate circular, August 2022
20. BusinessDay, bank savings rates, February 2026
21. Nairametrics, mutual fund assets, October 2026
22. Nairametrics, money market fund yields, August 2026
23. Nairametrics, Treasury bill auction, October 2026
24. SEC Nigeria, FAQs on Ponzi schemes and registered fund managers
25. Pulse, NDIC on MMM losses, March 2017
26. Trust Radio, CBEX collapse, April 2025
27. BusinessDay, EFCC on CBEX, 2025
28. Calcular Sueldo, fixed-term deposit rates from the BCRA comparator, October 2026
29. INDEC, consumer price index, September 2026
30. Chequeado, inflation in 2023
31. La Nación, the 2001 corralito
32. INDEC, balance of payments and international investment position, Q2 2026
Why “Too Good to Be True” Gets Lost in Translation was originally published in Coinmonks on Medium, where people are continuing the conversation by highlighting and responding to this story.