If anything didn't need a source then it's that the wealth of rich nations is upheld by the less rich nations. Anyone who isn't aware of that should not be listened to on any political or economical topic
Yet, what you said earlier struck me as incredibly "buzzwordy" so to say. You hinted at the choice being Marxism (we'll come back to that one) and capitalism with the "Nordic Model" (reductive US-centric naming schemes at work) being sold as a (for you not satisfactory I assume) middle ground.
You seem to reject this middle ground because (and correct me if I'm wrong, I'm reading between the lines here) it will not solve the huge discrepancy in wealth between our richest and our poorest countries in earth.
So far, so good. Now: when you talk about "Marxism", what do you mean by that exactly? I've seen this word thrown around countless times (again, mostly from the US) and most of the ppl doing so would have made Karl Marx vomit in his luscious beard when he heard what wild theories go by "Marxism" these days. So you'll have to be rather specific as to what you mean. "Marxism " isn't a clear-cut thing in the best of times.
Secondly: I'm assuming you want the global revolution the theories by Engels and Marx discuss im their economical parts and change the whole world towards a classless society by an uprising of the working class (however that would look). Isn't any call for such a thing another manifestation of the same air of superiority we 1sr worlders tend to fall victim to? Any capitalist would tell you that the nations held back by the "1st world" just needed to fend for themselves and all would be great, right? While I can see how this is not a sentiment one would support (I don't either), it's not completely off. Even if we in the west decided that Marxism (again, whatever that means) is the Bee's Knees right now, isn't it just the same kind of patronizing if we just assume that the people in poorer countries think the same and expect them to (again) follow our lead into what we tell them is a better future? What if they want capitalism or whatever else? (Unlikely, yet still)
Now regarding the "Nordic Model" or all other forms of social economy: I think it's safe to assume that the US and Europe have a comparable amount of "oppression per person" regarding foreign industry, yet the amount of exploitation of domestic workers will vary greatly.
Lacking many state-driven social security nets, the US will likely come upnfirst when it comes to local exploitation. So, if there was a way to ease this up while the rest of the world is not up for revolution stuff, why wouldn't it be worthwhile to take that route?
See, that's a thing AI ought to be useful for once. "Hey, CringeGPT, summarize these videos for me that make me nauseous out of sheer cringe"