Persistent Inflation and the Fed: What does it mean for your global purchasing power?

Persistent inflation is back at the centre of the financial conversation. After the big price rises of recent years, many households expected inflation to return quickly to 2% and interest rates to come down without too much trouble. But the latest picture is less comfortable: prices are still rising above the Federal Reserve’s target and the economy still has enough strength to keep the pressure alive.

In his 28 August speech at the Jackson Hole symposium, Fed Chair Kevin Warsh stressed that price stability does not happen on its own and that the 2% target, measured with the PCE index, remains firm. According to the figures he presented, PCE was up 3.7% year on year and the six-month pace was 4.1%. Warsh’s official speech also noted that progress towards the target had been modest over the past two years.

On 29 July the Federal Reserve kept the policy rate between 3.50% and 3.75% and described inflation as elevated relative to its 2% goal. The US Bureau of Labor Statistics (BLS) recorded a CPI of 3.4% year on year in July, with core inflation at 2.5%.

This does not mean the Fed will raise rates at its next meeting. It means something more relevant for a family that saves and invests: money can keep losing purchasing power faster than many plans have assumed, and rates can stay high for longer.

Persistent inflation does not mean everything rises equally

Inflation is a rate of change, not the price level. If inflation falls from 6% to 3%, prices are still rising; they are simply rising more slowly. For a household, the accumulated loss of purchasing power does not disappear when the monthly rate eases.

What’s more, the headline index is an average. Your personal inflation depends on where you live and what you consume:

That is why looking only at CPI or PCE can hide the real problem. The macro figure is a reference point; a FIRE plan needs its own spending assumption that can be revised.

The Fed itself is paying attention to persistence, not just the latest print. In his speech, Warsh explained that 54% of PCE components had risen by more than 3% over the previous twelve months, compared with 32% in the two decades before the pandemic. That is a sign of breadth: inflation is not concentrated in a single isolated item.

Why the Fed may keep rates high

The Federal Reserve has a dual mandate: maximum employment and price stability. When inflation stays clearly above 2%, cutting rates too quickly can stimulate demand just when supply has not yet normalised. If, on the other hand, it keeps policy restrictive, the risk of cooling employment and investment rises.

The decision is not automatic because inflation can have different drivers:

1. Strong demand: households, companies or governments spend more than supply can absorb.
2. Supply shock: energy, transport, food or supply chains push costs up.
3. Expectations: companies and workers build past increases into future prices and wages.
4. Money and financial conditions: credit, liquidity and asset valuations change spending.
5. Exchange rate: a weaker dollar makes US imports more expensive; a stronger one can ease part of that pressure but tightens conditions outside the United States.

Warsh insisted that the Fed must tell old data apart from current trends and that a single month is not enough. His message is a policy warning, not a promise to hike: if the underlying trend does not move clearly towards 2%, monetary policy must remain sufficiently restrictive.

The domino effect outside the United States

The Fed sets the short-term price of money in the United States, but its decisions spread to the rest of the world through four main channels.

1. The dollar and imported inflation

Relatively high US rates can sustain demand for dollars. For a country whose currency depreciates against the dollar, commodities, intermediate goods and imported products can become more expensive. The impact is especially important when companies or governments have dollar-denominated debt.

The IMF documents that US monetary policy is a significant driver of the global financial cycle. It also points out that the effects are not the same for everyone: countries with larger reserves, deep financial markets and anchored inflation expectations usually absorb external tightening better.

2. Capital flows and funding

If US assets offer a better risk-adjusted return, part of global capital may flow towards them. That can reduce the funding available to other markets, raise their risk premiums and push their central banks to keep rates higher than their domestic economies would like.

It is not a mechanical rule. A country can attract capital thanks to its growth, its commodities or its institutional stability. But the global direction of rates changes the starting point for every investor.

3. Bonds, mortgages and companies

Treasury yields serve as a benchmark for many assets. If they rise because of inflation expectations or higher-for-longer rates, borrowing costs for companies and households in other economies can rise too. Variable-rate mortgages suffer, corporate refinancing becomes more expensive and projects with distant profits become harder to value.

4. Equity valuations

A share price reflects, among other things, the present value of future profits. When the discount rate rises, companies whose value depends heavily on distant profits tend to suffer more. The result can be falling share prices even while current earnings still look solid.

In its April 2026 analysis of the world economy, the IMF models a scenario in which an asset-price correction and tighter financial conditions reduce global investment and activity. It is a sensitivity scenario, not an exact forecast; it helps to understand that markets can turn a monetary surprise into a growth shock.

What it means for your purchasing power in euros

A European investor can make a subtle mistake: seeing their dollar index fund rise and assuming their purchasing power has improved by the same amount. Your real result depends on three pieces:

Approximate real return = nominal investment return − inflation of your expenses − taxes and costs

If you also invest in assets denominated in another currency, the exchange rate can increase or reduce the result measured in euros. A strong dollar can temporarily boost the euro value of a US asset; a rising euro can do the opposite, even if the local index does not move.

No asset offers perfect protection. Cash protects liquidity, not necessarily purchasing power. Bonds pay nominal amounts, but carry duration and inflation risk. Equities may protect better over decades, but their falls can be deep and arrive just when you need to sell.

Persistent inflation and a FIRE portfolio

A FIRE plan should not depend on the Fed always getting the timing of its decisions right. It should work under several plausible combinations of inflation, returns and spending.

During the accumulation phase

Inflation raises your FIRE number because it increases your target spending. If you spend €30,000 a year today and your expenses grow 3% a year for 20 years, you would need roughly €54,000 a year to maintain the same nominal level of consumption. The exact figure depends on your basket of expenses, but the principle is unavoidable: the target must be updated in real terms.

Regular contributions help avoid concentrating the whole decision on a single market level. But it is also worth checking whether your savings grow with your income and whether the portfolio has enough exposure to assets capable of beating inflation over the long run.

As you approach independence

The main risk changes. It is no longer only about accumulating returns but about preventing a bad market sequence from destroying your ability to withdraw. A cash reserve and quality bonds for the first years can reduce the need to sell equities during a downturn.

That reserve should not be mistaken for a permanent solution. If inflation stays high for years, an overly conservative portfolio can lose purchasing power and force you to spend more capital than planned. Nominal stability and real growth are different goals.

During withdrawal

A reasonable strategy can split money by time horizon:

This is neither a universal allocation nor a personal recommendation. It is a way of linking each asset to a date of use. If the stock market falls, you can sell first what has suffered less; if inflation rises, you review spending and duration; if rates fall, you rebalance according to your rules, not the headline of the day.

How to test the scenario in My FIRE Simulator

Persistent inflation can be analysed without trying to guess the Fed’s next move. Try several scenarios and look at the effect on the probability of success:

1. Baseline inflation: use an assumption consistent with your own basket of expenses, not just the US headline index.
2. Persistent inflation: add several years of higher-than-expected inflation and lower real returns.
3. Higher for longer: lower the expected return on long bonds at the start and allow for an initial fall in their price.
4. Adverse dollar: if you hold global assets, test what happens when the exchange rate reduces the return measured in euros.
5. Sequence shock: combine an equity fall with high inflation during the first years of retirement.
6. Flexible spending: compare a rigid budget with one that temporarily cuts travel, purchases or discretionary withdrawals.

The goal is not to get a magic number. It is to discover which assumption dominates your result and which earlier decision can reduce its impact.

Conclusion: the goal is not to beat the Fed

The Jackson Hole warning deserves attention because inflation remains above target and monetary policy may stay restrictive. But it should not be turned into a binary bet on a specific rate hike.

The most important global consequence is that the Fed changes the price of money, the direction of capital flows and the present value of many assets. That can affect your mortgage, import prices, the euro-dollar exchange rate, an index fund and the amount you need to live off your portfolio.

To protect your purchasing power, think in real terms: update your expenses, diversify currencies and assets, keep cash for the short term and retain enough growth for the long term. A resilient FIRE portfolio does not need to guess the Fed’s next decision. It needs to survive inflation that takes longer than expected to go away.

Official sources consulted

• Federal Reserve: Kevin Warsh’s speech at Jackson Hole, 28 August 2026
• Federal Reserve: FOMC statement, 29 July 2026
• Bureau of Labor Statistics: CPI for July 2026
• IMF: Global Financial Stability Report, April 2026
• IMF: World Economic Outlook, April 2026
• IMF: transmission of US monetary policy to emerging economies

This article is for educational purposes only and does not constitute financial advice. Before changing your portfolio, consider your time horizon, taxes, the currency of your expenses, your liquidity needs and your real risk tolerance.

My FIRE Simulator

Creator of My FIRE Simulator and index investing enthusiast. My goal is to help you achieve financial freedom with math and no false promises.