Don't fall for that stupid McCarthyst BS of "3rd world means poor". Thats the retarded shit that the US gov sells to burgers who can't tell in which continent is México or Brazil.
Thirdworldism is an historical political line, leb by Yugoslavia, composed of those countries not aligned with NATO or the Warsaw pact (the first and second world in order of historical appearance).
Thats right, once Yugoslavia, India, México, Argentina, Venezuela and Brazil were in the same political block, along with many others pushing for a mixed economy (because pure capitalism or pure socialism is just dumb AF. Mixed economy FtW).