I can't speak to Yugoslavia's economic success, but it fell apart as bad as it did bc it was not being propped up by Tito's heavy-handed statesmanship and personality cult.
Without him unifying (read: suppressing) the south Slavs through fear or admiration, the internal nationalist grievances became too much to hold Yugoslavia together. Serbians clung to Yugoslavia as a means of maintaining their regional dominance, while the Slovenes, Bosnians, etc. resented Serbian hegemony over what was on paper meant to be a coequal union of south Slavic peoples.
The ensuing breakup and wars greatly damaged whatever prosperity a unified Yugoslavia may have had.
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Diagnoses: AS, Depression, General & Social Anxiety
I guess I just wasn't made for these times.
- Brian Wilson
Δυνατὰ δὲ οἱ προύχοντες πράσσουσι καὶ οἱ ἀσθενεῖς ξυγχωροῦσιν.
Those with power do what their power permits, and the weak can only acquiesce.
- Thucydides
Conservatism discourages thought, discussion, consensus, empathy, and hope.