【Market Structure】How Commodity Price Discovery Works in Physical Markets
Quote from chief_editor on May 31, 2026, 3:00 amCommodity price discovery in physical markets explained. Learn how physical prices are found through bids, offers, assessments, and market activity.
Price discovery in physical commodity markets is the process by which the prevailing market price for a specific commodity at a specific location and time is determined through the interaction of buyers and sellers. Physical commodity markets are not centralized exchanges where all trades are reported publicly in real time — they are primarily Over-The-Counter (OTC) markets where transactions occur bilaterally between parties who may or may not disclose their trade details publicly.
The reason physical commodity price discovery is more complex than exchange price discovery is that physical commodities vary by grade, location, and timing — each transaction reflects a unique set of specifications, and aggregating these into a meaningful market price requires methodology and judgment.
How Price Reporting Agencies Assess Physical Prices
Price Reporting Agencies (PRAs) — principally S&P Global Commodity Insights (formerly Platts), Argus Media, and ICIS — are the primary source of published physical commodity price assessments. PRAs collect information from market participants — bids, offers, and confirmed transactions — during a defined window each trading day, typically called the Market on Close (MOC) or assessment window. Using this information, a PRA editor applies a published methodology to produce a daily price assessment that reflects where a standardized commodity was trading at a specific location.
For example, the Platts Dated Brent assessment for physical North Sea crude oil is produced each trading day by collecting bids and offers submitted by oil companies and trading houses for physical Brent-quality cargoes deliverable within a specific forward window. The assessment reflects the highest bid and lowest offer in that window, adjusted by the PRA editor according to the published methodology for the benchmark.
The assessed price is not necessarily the price at which a transaction actually occurred on that day — it is the editor's determination of where the market was, based on submitted market data and observable transactions. This is a distinction that matters when PRA assessments are used as price references in supply contracts: the contract price is based on the PRA's methodology and market view, not on a specific recorded trade.
The reason PRA methodology matters is that PRAs have discretion in how they evaluate submitted information, which submissions are included, and how outliers are handled. Market participants who submit data that is subsequently assessed differently from what they intended may dispute the outcome. PRAs publish their methodologies and offer formal complaint processes, but the assessment itself is the PRA's independent editorial judgment.
How Exchange Prices and Physical Prices Interact
Exchange prices — from the London Metal Exchange (LME), the CME Group (Chicago Mercantile Exchange), the Intercontinental Exchange (ICE), and others — are fully transparent: every transaction is reported and the settlement price is published. These exchange prices serve as benchmarks to which physical market premiums and discounts are applied.
The relationship between exchange prices and physical prices is dynamic. When physical demand for nearby delivery is strong, physical prices trade at a premium to exchange settlement prices, pulling the basis toward positive territory. When supply is long and storage is filling up, physical prices trade at a discount to the exchange.
In some commodity markets, price discovery happens primarily through traded auctions. Palm oil prices on the Bursa Malaysia Derivatives exchange, rubber prices on the Singapore Exchange (SGX), and cocoa prices on the Intercontinental Exchange (ICE) serve as both price discovery mechanisms and physical delivery points.
For commodities without liquid exchange contracts — certain specialty chemicals, some minor metals, or niche agricultural products — price discovery relies almost entirely on broker networks, PRA assessments, and bilateral negotiation between market participants who know each other and share market intelligence.
Physical commodity price discovery is a distributed process that combines exchange settlement prices, PRA assessments, bilateral negotiation, and broker intelligence — the result is a price that reflects actual supply and demand conditions but is never as fully transparent as a centralized exchange price.
Commodity price discovery in physical markets explained. Learn how physical prices are found through bids, offers, assessments, and market activity.
Price discovery in physical commodity markets is the process by which the prevailing market price for a specific commodity at a specific location and time is determined through the interaction of buyers and sellers. Physical commodity markets are not centralized exchanges where all trades are reported publicly in real time — they are primarily Over-The-Counter (OTC) markets where transactions occur bilaterally between parties who may or may not disclose their trade details publicly.
The reason physical commodity price discovery is more complex than exchange price discovery is that physical commodities vary by grade, location, and timing — each transaction reflects a unique set of specifications, and aggregating these into a meaningful market price requires methodology and judgment.
How Price Reporting Agencies Assess Physical Prices
Price Reporting Agencies (PRAs) — principally S&P Global Commodity Insights (formerly Platts), Argus Media, and ICIS — are the primary source of published physical commodity price assessments. PRAs collect information from market participants — bids, offers, and confirmed transactions — during a defined window each trading day, typically called the Market on Close (MOC) or assessment window. Using this information, a PRA editor applies a published methodology to produce a daily price assessment that reflects where a standardized commodity was trading at a specific location.
For example, the Platts Dated Brent assessment for physical North Sea crude oil is produced each trading day by collecting bids and offers submitted by oil companies and trading houses for physical Brent-quality cargoes deliverable within a specific forward window. The assessment reflects the highest bid and lowest offer in that window, adjusted by the PRA editor according to the published methodology for the benchmark.
The assessed price is not necessarily the price at which a transaction actually occurred on that day — it is the editor's determination of where the market was, based on submitted market data and observable transactions. This is a distinction that matters when PRA assessments are used as price references in supply contracts: the contract price is based on the PRA's methodology and market view, not on a specific recorded trade.
The reason PRA methodology matters is that PRAs have discretion in how they evaluate submitted information, which submissions are included, and how outliers are handled. Market participants who submit data that is subsequently assessed differently from what they intended may dispute the outcome. PRAs publish their methodologies and offer formal complaint processes, but the assessment itself is the PRA's independent editorial judgment.
How Exchange Prices and Physical Prices Interact
Exchange prices — from the London Metal Exchange (LME), the CME Group (Chicago Mercantile Exchange), the Intercontinental Exchange (ICE), and others — are fully transparent: every transaction is reported and the settlement price is published. These exchange prices serve as benchmarks to which physical market premiums and discounts are applied.
The relationship between exchange prices and physical prices is dynamic. When physical demand for nearby delivery is strong, physical prices trade at a premium to exchange settlement prices, pulling the basis toward positive territory. When supply is long and storage is filling up, physical prices trade at a discount to the exchange.
In some commodity markets, price discovery happens primarily through traded auctions. Palm oil prices on the Bursa Malaysia Derivatives exchange, rubber prices on the Singapore Exchange (SGX), and cocoa prices on the Intercontinental Exchange (ICE) serve as both price discovery mechanisms and physical delivery points.
For commodities without liquid exchange contracts — certain specialty chemicals, some minor metals, or niche agricultural products — price discovery relies almost entirely on broker networks, PRA assessments, and bilateral negotiation between market participants who know each other and share market intelligence.
Physical commodity price discovery is a distributed process that combines exchange settlement prices, PRA assessments, bilateral negotiation, and broker intelligence — the result is a price that reflects actual supply and demand conditions but is never as fully transparent as a centralized exchange price.