The UP is more industrialized than Japan, will have a larger population, is sitting on a far larger pile of resource, has been stable and capitalist for far longer, is surrounded by peers for continental trade and linked to the British Empire's economy (likely US). A France or Italy given the same population as Japan's will either equal or exceed the latter's economy.
No, no and no?
We have been repeatedly told that the UP was only midly industrialized during the 20th century as it entered the race quite late, the resources only push you so far (or else why would Japan be what it is OTL?), the British empire's economy is not something sure as OTL it did implode and ruined Argentina.
Being well off and a powerful country is not the same as being one of the three biggest world economies or else why wouldn't Brazil do the same?
TTL no nation is likely to replicate OTL Japan's Post-War market domination, certainly not Japan itself. The third and Fourth TTL economies should be the Brazil and the UP by the 21st century.
Why? What are you using as the basis of this conjecture? Are you perchance the author?
Japan is famous for having very low natural resources, it's why they invaded China, yet it is still the 3rd... Consider these points in favour:
1. Very good agricultural sector
2. Abundant natural resources
3. Larger population than Japan (150million vs 120million)
4. A history of stable democracy with a satisfied populace, removing the likelihood of the dictatorships that crippled South America OTL
5. Falklands Oil
6. Strong trading history and ties with major nations
7. No conceivable military threat nearby (Brazil desires no UP territory)
Why couldn't it rival OTL Japan?
Ok, let's see then:
1 didn't help OTL.
2 Didn't help OTL
3 It only helps that much (see Brazil, India, etc)
4 That
we know. The TL only covers up to the Early 20th century.
5 It's mostly useless and requires of modern technology to exploit so it only becomes relevant during the 21st century.
6 And? Argentina also had this. We need to know the state of the rest of the planet before saying how useful this may be.
7 Says who? Also, there are plenty of military threats, though you could say the surety of war one could find in Europe was missing.
Because Japan is an outlier. You guys are trying to fit a square peg on a round hole. Will the UP have a big economy, maybe comparable or greater than Germany's and/or other european powers? Probably. Will it be a gigantic monstruosity comparable to the US or China? Hahahah,
no.
I get everyone loves Protagonist power™ but the way everyone wants to wank every ATL "protagonist" country
every fucking time is quite grating.