Without a larger market-driven world to borrow from, it's doubtful it would have acquired fertilizer, factories, automobiles, etc.
The Soviet economy collapsed in the end, with millions dying in the early 1990s as the support network it administered broke down.
That it was able to last as long as it did is because it also did have a massive black market, that supplied people with much of their necessities:
https://blogs.commons.georgetown.edu/rees-577-fall2016/2016/...
The corruption in Russia today is a legacy of that Soviet-era black market.