Issue 012 - Household budgets - Weighted average
What does a 7.1% import-price jump cost a household?
BLS reported that U.S. import prices rose 0.3% in June and 7.1% from June 2025 to June 2026, the largest year-over-year import-price increase since August 2022. Translate that macro headline into a rough household budget impact.
The problem
Estimate how much a 7.1% rise in import prices would cost the average U.S. household per year if some portion of that increase is passed through to consumer prices.
Is the household impact closer to $50/year, $500/year, or $5,000/year?
Because Fermi problems target an order of magnitude, I normally use no more than two significant digits and write most calculations in scientific notation; the Fermi reference explains both conventions.
Before checking sources
Matt's first pass
I assumed average household spending in the United States is about $60,000 per year.
Then I assumed 50% of purchased goods and services are reliant on imports, and 50% of increased import costs are passed through to consumers.
import-impacted spending ~= $6 x 10^4 x 50%
~= $3 x 10^4
consumer pass-through ~= 7.1% x 50%
~= 3.5%
~= 3.5 x 10^-2
annual household impact ~= ($3 x 10^4) x (3.5 x 10^-2)
~= $1.1 x 10^3
~= $1,100/yearThat is about $90 per month, which is not insignificant against a $60,000 annual household budget.
Calibration Score
Matt's Calibration Score: 80 / 100
Higher is better: earn points for accurate pegs, sound models, correct math, and a result close to the sourced answer. The image shows percent full of it: 100 minus the Calibration Score.
Pegs: 20/30. Household spending was low and import exposure was high, but the errors partly canceled.
Model: 30/30. Spending times exposure times price change times pass-through was the right model.
Math: 10/10. The arithmetic was clean.
Result: 20/30. The answer was close to the broad calibrated range.
Grounding facts
A $500 annual household impact is about $40 per month. A $1,000 impact is about $80 per month. Those numbers can matter a lot for constrained households, but they are not the same scale as rent, mortgage payments, health insurance, or car payments for many households.
Across roughly 130 million U.S. households, however, $500 per household would represent about $65 billion per year of household budget pressure. Small household numbers can become large national totals.
After checking sources
Check and recalibrate
The BLS Consumer Expenditure Survey reported average annual expenditures of $78,535 per consumer unit in 2024. Use $80,000 as the memory peg:
average household spending ~= $8 x 10^4/yearThe import-exposed share is the hard part. Matt's 50% assumption is plausible if you are thinking about goods-heavy shopping categories such as electronics, clothing, furniture, appliances, cars, toys, and tools. But households also spend a lot on housing, health care, local services, insurance, taxes, utilities, and other categories that are not directly import goods.
A San Francisco Fed estimate found that about 11% of U.S. consumer spending can be traced to imports after accounting for imported final goods, imported inputs, and domestic value added inside imported retail prices. That makes 10% to 20% a useful Fermi range for import-exposed household spending.
Now run pass-through scenarios:
low scenario:
$8 x 10^4 x 10% x 7.1% x 25%
~= $1.4 x 10^2/year
~= $140/year
middle scenario:
$8 x 10^4 x 15% x 7.1% x 50%
~= $4.3 x 10^2/year
~= $430/year
higher scenario:
$8 x 10^4 x 20% x 7.1% x 75%
~= $8.5 x 10^2/year
~= $850/yearA broader high-pass-through assumption can reach roughly $1,000 per year, which is close to Matt's first-pass result:
$8 x 10^4 x 20% x 7.1% x 100%
~= $1.1 x 10^3/yearA good Fermi answer is therefore: roughly a few hundred dollars per household per year, with a plausible range from about $100 to about $1,000 depending on exposure and pass-through. That is much closer to $500/year than to $50 or $5,000 for an average household.
One caveat: BLS import-price indexes measure imported goods prices, not the full consumer price paid at the register. Retail prices include domestic transport, warehousing, labor, rent, financing, marketing, and margins. That is why pass-through and exposure matter as much as the headline 7.1%.
Post-check reflection
Matt's reflection
Looks like I estimated average household expenditures too low, though not by a huge amount, and I overestimated the percentage of spending being import-exposed. As is often the case, these bad estimates canceled out and I came up with an answer that is pretty close to the well-justified one.
Nothing too surprising about that number. It is right about where I would have expected.
Regarding the news item, looking at the actual household numbers, I can see why some folks would be upset by it. But that is less than half the cost of taking my family to dinner once a week, so it is not going to have a huge impact on my life. Not great, but not a huge deal.
Recommended memory peg
Remember average annual household spending ~= $8 x 10^4, and a rough import-content peg of about 10% of consumer spending. For pass-through problems, use impact = spending x exposed share x price change x pass-through.
Reader results
Bars show how submitted estimates sort into the answer choices from the gut-check prompt.