Much of the CPTPP's gain on Korean car exports comes from Mexico, KIET finds
KIET found Korea lost competitiveness in 46 of 90 car product lines in CPTPP markets, lines that make up 56.3% of its auto exports to members. The institute stops short of naming Korea's exclusion from the pact as the cause.
The Investor · Invest desk
Bar comparison of RSCA change in the car lines where Korea weakened: Mexico up 0.312, all 11 CPTPP members up 0.048, the other 10 members excluding Mexico down 0.042, and Korea down an average of 0.199.
RSCA change in car lines where Korea's competitiveness fell In RSCA change
| Item | Value | Claim |
|---|---|---|
| Mexico | 0.312 RSCA change | 1 |
| All 11 CPTPP members | 0.048 RSCA change | 8 |
| Other 10 members, excl. Mexico | −0.042 RSCA change | 1 |
| Korea, average | −0.199 RSCA change | 8 |
What happened
- In those car lines Korea's RSCA reading fell an average of 0.199 after the pact took effect, while the 11 members' readings rose 0.048.
- Mexico's reading rose 0.312 in the lines where Korea weakened, while the other ten members' fell 0.042.
- In shipbuilding, competitiveness fell in 15 of 35 lines covering 43.9% of exports to members, with Korea's reading down 0.262 and the members' up 0.125.
- Across the lines where Korea weakened inside the CPTPP, the median decline was 0.183, against 0.035 in markets outside it.
Why it matters
- exposure Korea has no preferential agreement with Mexico, and Mexico's 5% to 50% tariffs on non-FTA partners since January could widen the gap in the three lines where tariff terms mattered: two passenger-car bands and EVs.
- constraint RSCA compares product shares, so Korea's reading can fall because members trade more of a product among themselves, not only because Korea sells less of it.
- contradiction The institute calls the pattern hard to explain by broad manufacturing weakness, yet lists China's capacity expansion and industry conditions as other drivers. The data fit both stories.
- decision President Lee Jae-myung told officials not to apply this year, putting talks with farmers and fishermen first, while the institute cautions that a prolonged period outside could erode Korean products further.
Put the two sides of the car index together and the gap between Korea and the members is 0.247 points [19]. In shipbuilding it is 0.387 [16], the widest among the 15 manufacturing industries the institute analyzed [3]. Most of the car gap, though, sits in one country.
Mexico's rise and the other ten members' fall add up to a 0.354 swing [18]. The ten's fall is about a fifth of Korea's own, 21% [17], so in the lines where Korea weakened, ten of the eleven members slipped in the same direction by a much smaller margin.
The wider claim is where the sums are less tidy. The median fall inside the bloc is 5.2 times the median outside it [20]. But of the 2,474 lines that declined inside, 796 held steady or improved outside [11]. That leaves 1,678 lines [21], or 67.8%, that weakened in both places [22]. We think the report supports a narrower claim than exclusion: an extra loss inside the bloc of about 0.148 (the difference between the two medians, or rather a stand-in for it, since a difference of medians is not the median of the differences) [23], with Mexico's tariffs as the one channel the institute documents in cars. The counter-thesis is the institute's own, that China's capacity expansion and industry conditions also move these numbers.
The report, from the Korea Institute for Industrial Economics and Trade, compares 2012-2018 with 2021-2024 [4] and drops 2019 and 2020 for the pandemic [6]. Anything else that changed between those windows sits inside the same 0.148. We would call the exclusion reading wrong if that gap closes once lines are matched for the other factors, or if Korean car lines fall as far in markets where its tariff terms match the members' own.
What to watch
- Whether the next KIET data show Mexico's tariffs on non-FTA partners widening the gap in Korea's passenger-car and EV lines.
- Whether Seoul sets a CPTPP application date after its consultations with farmers and fishermen.
- Any follow-up that matches product lines for China's capacity expansion and tariff terms, which would test the 0.148 gap between medians.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence58
- Adoption
- Insufficient
- Hype gap+15
- Incentives40
- Confidence62
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Based on the lines where Korean competitiveness fell, Mexico's RSCA rose 0.312, while the other 10 members, excluding Mexico, saw theirs fall 0.042; much of the overall gain in automobile competitiveness among CPTPP members came from Mexico.
- [2]
In shipbuilding, competitiveness fell in 15 of 35 detailed product lines, which accounted for 43.9% of Korea's shipbuilding exports to CPTPP members; Korea's RSCA in those lines fell an average of 0.262 while that of CPTPP members rose 0.125.
- [3]
The gap between Korea and member countries was the widest in shipbuilding among the 15 manufacturing industries the institute analyzed.
- [4]
Competitiveness declined in 46 of 90 detailed automobile product lines, according to a Korea Institute for Industrial Economics and Trade report released on the 14th that compared 2012-2018, before the CPTPP took effect, with 2021-2024, after it did.
- [5]
The 46 automobile lines accounted for 56.3% of Korea's automobile exports to CPTPP members.
- [6]
The institute excluded 2019 and 2020 from the analysis because of the COVID-19 pandemic.
- [7]
The revealed symmetric comparative advantage (RSCA) index compares the share a given product holds in Korea's exports to CPTPP members against the share that product holds in trade among CPTPP members themselves; a higher reading indicates stronger relative export competitiveness in that market.
- [8]
In the automobile lines where competitiveness fell, Korea's RSCA dropped an average of 0.199 from before the pact took effect, while the 11 CPTPP members saw their competitiveness in the same lines rise 0.048.
- [9]
Korea has no preferential trade agreement with Mexico, leaving it at a tariff disadvantage against CPTPP members; that gap could widen further after Mexico began applying tariffs of 5% to 50% in January on some products from countries without a free trade agreement.
- [10]
The institute found that differences in tariff terms affected competitive conditions for three major automobile lines: the two passenger-car categories by engine displacement and electric vehicles.
- [11]
Of the 2,474 product lines where Korea's competitiveness within the CPTPP declined, 796, or 32.2%, held steady or improved outside the bloc.
- [12]
The median decline was 0.183 within the CPTPP, larger than the 0.035 recorded in markets outside it.
- [13]
The institute said non-membership cannot be identified as the direct cause of the decline; factors outside the agreement, including China's capacity expansion, shifts in industry conditions and the competitiveness of individual industries, also affect export competitiveness.
- [14]
The institute cautioned that a prolonged period outside the bloc could further erode the position of Korean products in the CPTPP market.
- [15]
President Lee Jae-myung recently instructed officials not to apply to join the CPTPP this year, saying sufficient dialogue with farmers and fishermen and the restoration of trust should come first.
- [16]
The shipbuilding-line gap between Korea and CPTPP members is 0.387 index points.
- [17]
The other ten members' 0.042 fall in the car lines is about 21% of Korea's 0.199 fall.
- [18]
Mexico's 0.312 rise and the other ten members' 0.042 fall add up to a 0.354 swing.
- [19]
The car-line gap between Korea and CPTPP members is 0.247 index points.
- [20]
The median decline inside the CPTPP is about 5.2 times the median decline outside it.
- [21]
1,678 of the 2,474 lines that declined inside the CPTPP did not hold steady or improve outside it.
- [22]
About 67.8% of the lines that declined inside the CPTPP also weakened outside it.
- [23]
The two medians differ by 0.148 index points.
- [24]
The report said the pattern is difficult to explain by a broad weakening of Korean manufacturing alone.
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Sources
2 independent publishers whose own reporting we read for this story.
- en.sedaily.comKorea Loses Ground in CPTPP Markets for Cars, Ships: KIET
2 articles · October 13, 2026
- koreajoongangdaily.comJoining means 'survival': Nearly half of Korea's exports lose ground in Pacific trade pact markets, report warns
1 article · October 14, 2026
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Topics
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