simple, visit China
they've lifted perhaps 500 million people out of poverty, there is no UBI in China, but there is motivation to work. If you don't succeed in the city the alternative is that there is always room for another peasant on the farm.
is that a universal safety net? or a universal threat?
perhaps its a matter of perspective, but using a simple measures of improvements in
hogs per person consumption
or
cars per person consumption
China very strongly demonstrates that European type socialism is a failure compared to communism with "Chinese Characteristics"
(I'm not familiar with Ayn Rand, but I did read Animal Farm around 15 years of age, I realise its about eastern European socialism, but its just such a perfect description of modern day China, "The creatures outside looked from pig to man, and from man to pig, and from pig to man again; but already it was impossible to say which was which.")
Animal Farm, by George Orwell : chapter10