Price Erosion

Price erosion is a component of patent lost profits damages that compensates the patent owner for having to lower the PRICE it charges for its patented product because of infringing competition in the market. THEORY: when an infringer enters the market without authorization, it increases supply of the patented (or competing) product; basic economics — increased supply with same demand leads to lower prices; the patent owner may lower its price to remain competitive; those lower prices represent a loss to the patent owner even on units it DID sell; LEGAL BASIS: Crystal Semiconductor Corp. v. TriTech Microelectronics Int'l (Fed. Cir. 2001): the Federal Circuit confirmed that price erosion is a recoverable form of lost profits; the patent owner need not prove that it actually lowered its price — rather, it must prove that but for the infringement, it would have sold at a HIGHER PRICE; Rite-Hite Corp. v. Kelley Co. (Fed. Cir. 1995, en banc): established the 'but for' causation standard for lost profits generally — price erosion must be caused by the infringement; SEPARATE FROM LOST UNIT SALES: price erosion damages are DISTINCT from 'lost sales' damages (units that the patent owner would have sold to customers who instead bought the infringing product); price erosion damages arise from the LOWER PRICE ON UNITS THE PATENT OWNER ACTUALLY SOLD; a patent owner can recover BOTH: (1) lost profits on units it did not sell (lost to infringer) AND (2) price erosion damages on units it DID sell at artificially suppressed prices.

Price erosion damages require expert testimony and market economic analysis: BURDEN OF PROOF: the patent owner bears the burden of proving price erosion by a preponderance of evidence; proof requires: (1) ACTUAL PRICE REDUCTION: evidence that the patent owner actually reduced prices during the infringement period; OR evidence that the patent owner would have charged higher prices but for the infringement; (2) CAUSATION: the price reduction was CAUSED BY the infringing competition — not by other market factors (general economic conditions, product obsolescence, technology shifts, competitive pricing from non-infringing products); (3) QUANTIFICATION: the specific amount of price erosion per unit × units sold during the infringement period; ECONOMIC ANALYSIS: a damages expert typically: (a) identifies the price trend before infringement began (the 'but for' price); (b) compares pre-infringement prices to prices during and after infringement; (c) controls for non-infringement factors that would also have reduced prices (inflation, technology improvement, market competition from non-infringing products); (d) uses econometric regression or market analysis to isolate the infringement's contribution to price depression; CAUSATION DIFFICULTY: courts require that the price reduction be attributable to the infringement, not to other market factors; in competitive markets with many participants, isolating the infringer's specific price impact is methodologically challenging and frequently subject to Daubert challenges.

Lost profits (including price erosion) are governed by the Panduit Corp. v. Stahlin Bros. Fibre Works four-factor test from the 6th Circuit (widely adopted by the Federal Circuit): PANDUIT FOUR FACTORS: (1) DEMAND FOR THE PATENTED PRODUCT: the market desires a product with the patented features; (2) ABSENCE OF ACCEPTABLE NON-INFRINGING SUBSTITUTES: there are no non-infringing alternatives that customers would have purchased instead; (3) PATENT OWNER'S MANUFACTURING AND MARKETING CAPACITY: the patent owner had the ability to make and sell more units to meet the demand; (4) THE AMOUNT OF PROFIT: the patent owner would have made additional profits on those sales; PRICE EROSION AND PANDUIT: price erosion can be proven as an independent theory alongside the four-factor Panduit test OR as part of the quantification of damages (factor 4); when claiming price erosion for units the patent owner actually sold (not lost sales), factors 1 and 2 are less central — the patent owner already made those sales; causation remains the key issue (factors 3 and 4 still apply to the extent); MARKET SHARE APPROACH (Grain Processing): where Panduit factor 2 (no non-infringing substitutes) cannot be met, the patent owner may use the 'market share' approach — it would have made sales in proportion to its market share; price erosion under the market share approach: the patent owner proves it would have priced products higher absent infringement, and the market share approach determines what additional profits that higher pricing would have generated.

Price erosion interacts with market share calculations in complex ways: COMBINED APPROACH: a sophisticated damages analysis may claim: (1) LOST UNIT PROFITS: units lost to infringing competition (calculated under Panduit or market share approach); (2) PRICE EROSION ON ACTUAL SALES: reduced price received on units the patent owner DID sell during the infringement period; MARKET SHARE PRICE EROSION: when the patent owner uses the market share approach for lost unit profits (because non-infringing substitutes exist), price erosion damages can still be claimed for the market share of actual sales that occurred at depressed prices; the patent owner says: 'I did make these sales, but I made them at lower prices because of the infringement — I should recover the price differential on those sales'; COMPOUNDING EFFECTS: in markets with strong network effects or where being a price leader matters, price erosion can extend beyond the direct competitive period — even after the infringer leaves the market, prices may remain depressed because customers were educated to expect lower prices; courts are divided on whether such 'residual' price erosion is recoverable; STANDARD-SETTING MARKETS: in standard-essential patent contexts, price erosion damages may be limited by FRAND royalty rate caps — a patent owner cannot claim lost profits above what a FRAND royalty would have provided, because the patent owner was obligated to license at FRAND rates.

Courts recognize several types of harm to a patent owner's market position that go beyond simple price erosion: PURE PRICE EROSION: the patent owner lowered its price to match or beat the infringer's price on the SAME product; quantified as (but-for price − actual price) × units sold; MARKET SHARE EROSION: the patent owner lost market share to the infringer's lower-priced products; quantified as lost sales (Panduit lost profits approach); PRICE-INDUCED MARKET SHARE LOSS: the infringer's lower prices caused the patent owner to lose market share EVEN ON UNITS WHERE PATENT OWNER MATCHED THE LOWER PRICE — because some customers chose the infringer's lower price even when the patent owner lowered its price too; this is a hybrid: market share loss + price erosion simultaneously; BRAND DAMAGE / MARKET POSITIONING: some patent owners argue that competing with infringers forced them to abandon premium market positioning — brand erosion; courts are skeptical of brand damage claims without specific economic proof; CUSTOMER RELATIONSHIP EROSION: customers trained to expect lower prices after infringement may resist returning to pre-infringement prices even after the infringement ends; courts generally do not award speculative future pricing harm without strong evidence; PREJUDGMENT INTEREST ON PRICE EROSION: price erosion damages accrued throughout the infringement period; prejudgment interest under 35 U.S.C. § 284 applies to price erosion damages calculated as of the date of infringement for each unit sold at the depressed price.