Methodology

Valuation theory offers three lenses, and a rigorous answer triangulates them. The asset approach sums the replacement/market value of everything owned. The income approach discounts all future economic output to a present value, as if Earth were a company. The market approach reads prices off comparable transactions — of which, for a planet, there are none.

We take the asset approach as the headline, because it is the closest analog to a real "market cap" and the only one with constituents to break down. The income approach runs alongside as a cross-check.

The headline is the sum of a partition of global wealth into non-overlapping slices: human capital (the present value of all future labor — the largest piece), produced capital (real estate, listed equity, infrastructure, private business), natural capital (forests, minerals, farmland, energy), and monetary assets (gold and crypto). The human, produced, and natural backbone is anchored to the World Bank's Changing Wealth of Nations, the standard comprehensive-wealth framework used in national balance sheets.

The slices are drawn so they don't overlap — listed equities are the marked value of corporate produced capital, "other produced capital" is explicitly the remainder reconciled to the comprehensive-wealth total, and so on. Every boundary is a documented modeling choice, shown on the constituents page.

The single most important rule, and the most common way to get this wrong: at the planetary level, financial claims do not add to wealth. Every bond is someone's asset and someone else's debt; every bank deposit is the bank's liability; every dollar of broad money is a claim on the central bank. Summed across the whole world, claims cancel against the real assets that back them. So total global debt (~$315T) and broad money (~$120T) are reported as context on the constituents page and never added to the headline.

This is why "add up all the stocks, bonds, real estate, and money" overstates Earth's worth by an order of magnitude — it double-counts the same underlying capital through its paper claims.

Derivatives and options. The headline-grabbing "quadrillion-dollar derivatives market" is a notional figure — ~$700T of reference amounts (BIS). Notional is not wealth: gross market value is ~$25T and, after offsetting positions, the net is ~$3T. Every contract is zero-sum (one winner, one loser), so it nets to zero like any other claim. Shown as context, never summed.

Money supplies. M0 (base money), M1, M2, and broad money are nested subsets of one another, not separate piles to add. We carry broad money once, as a claim that nets to zero.

Intellectual property and intangibles. Patents, copyrights, brands, software, and data are real and large (~$70T), but they are already embedded in what we count: a listed company's market value reflects its IP and goodwill, and private-firm intangibles sit inside produced capital. A separate "IP" line would double-count the equity that already prices it in.

Rights. Property, mineral, and water rights are embedded in the real estate and natural-capital values; tradable rights like radio spectrum and carbon credits are small (~$1–3T) and already priced into the assets they attach to.

Each constituent declares its source, valuation method, update mode, and double-count treatment — all visible on the constituents page. Live-market slices are marked from public financial data (equity indices, the gold fix, total crypto market cap); the structural backbone is anchored to annual wealth-accounting vintages and accreted between them.

The headline moves every day like a real balance sheet. Each constituent updates by one of four modes:

• live_market — value = base × (today's level ÷ base level). Listed equities, gold, crypto. This is where the daily motion comes from.
• accrete — value = base × (1+g)^(days/365), with g the nominal global growth rate. The slow backbone drifts smoothly rather than stair-stepping at each annual release.
• modeled — piecewise-linear between annual wealth vintages.
• held — constant between vintages.

If a data source fails, that constituent carries its last-known value (flagged "carried") and the headline is still computed — it never crashes on a bad fetch.

As a second opinion, we capitalize global output as a growing perpetuity — Earth as a company paying the world's GDP as a dividend:

The estimate is hypersensitive to the spread (r − g): a small change swings it wildly. That instability is the whole reason it's a cross-check and not the headline. With current inputs:

central $3.81 quadrillion, ranging $3.27 quadrillion – $4.57 quadrillion across a ±50 bp swing in (r − g).

• World-equity proxy. The daily equity mark uses a broad index; scaling a US-heavy index to world equities assumes co-movement that drifts.
• Partition vs. totals. Splitting comprehensive wealth into equities / real estate / other produced capital involves documented overlap judgments; the financial-claims view is shown separately so you can check we did not naively stack paper on top of real assets.
• Reconstructed history. Values before launch are rebuilt from the constituents' driver series, not captured live, and are flagged as such.
• "Priceless" is also an answer. Market cap presupposes the asset is sellable and that owners survive the sale; Earth violates both, so the honest upper bound is "undefined." We report the finite going-concern figure because it's the useful one.