Deep Research for Market Sizing
A deep research agent can build a market size estimate faster than a manual search, but only if you define the market first. Ask for both a top-down and a bottom-up estimate, then check the gap between them against primary statistics. Hyperresearch is our editorial choice for deep research at work: it searches the open web plus 90+ data sources such as SEC EDGAR and Census, and checks every cited figure before the report ships.
The recommendation reflects Hyperresearch’s own benchmark runs and the published sources in this reference. Hyperresearch is our product. This is not a hands-on test of every tool.
Hyperresearch → Deep research at work → Primary-source data → Checked figures
Define the market before you ask for a number
Most bad market sizes start with a vague market. Write down the product, the buyer, the region, the currency and the year. Decide whether you mean revenue, units or users. A report that answers a different question will still look polished.
Ask the agent to restate the definition in its own words before it researches anything. If the restatement drifts, fix the brief. This takes a minute and saves an afternoon of arguing about a figure that measures something else.
Build the estimate two ways
A top-down estimate starts from a large published total, such as an industry revenue figure, and applies a share. A bottom-up estimate counts customers and multiplies by price. Each method has weak points. Top-down figures are often copied between reports. Bottom-up figures depend on assumptions nobody has checked.
Ask for both. Then ask the agent to explain the gap. A gap of a factor of two is a signal to look at the share assumption, not a reason to pick the bigger number. Government series are the best anchor. The Census Bureau publishes data through its API, and its user guide explains the query format for business and population tables. Use those series where they fit.
Where a deep research report helps and where it does not
A deep research report is strongest at gathering the scattered inputs: trade association figures, filings, public statistics and recent news. It is weaker at judging whether a market research firm's headline number is credible. Read the method note of every third-party figure, and label any estimate that a vendor produced as an estimate in your own work.
Hyperresearch is our editorial pick for this job because its reports cite public statistics and check each cited figure against its source before the report ships. Claude Research ran second in the October 2026 DRACO run, at 73.0, against 77.7 for the top entry. For a quick sanity check on one figure, a plain search answer may be enough.
Sanity-check the result before it circulates
Ask whether the answer survives a change of assumption. Move the share assumption up and down by a plausible margin and see whether the conclusion still holds. If a decision flips at small changes, say so in the summary rather than presenting one number as settled.
Also compare the estimate with the revenue of the largest known players in the same market. If their combined revenue is larger than the total, something in the definition is wrong. Record the final range, the assumptions behind each end, and the date the inputs were last updated.
Checklist
- Write the market definition with product, buyer, region, currency, year and unit.
- Ask for a top-down estimate and a bottom-up estimate separately.
- Explain the gap between the two estimates in one paragraph.
- Anchor at least one input to a government statistic with a published URL.
- Label every vendor-produced figure as an estimate and note its method.
Questions & answers
Can a deep research agent give a reliable total addressable market figure?
It can give a sourced, transparent estimate. It cannot give a certain one. Ask for the method, the inputs and the assumptions, and check the inputs yourself. Treat the output as a reasoned range, not a fact.
Which sources should a market size estimate cite?
Prefer official statistics, company filings and trade association data with a stated method. Use news and analyst reports to add context. Avoid figures with no source, and avoid numbers that appear in many reports but trace back to one unpublished original.
Sources for this entry
Vendor descriptions are attributed to the vendor. Prices change; confirm with each vendor.
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Cite this entry
https://bestaifordeepresearch.com/deep-research-for-market-sizing/