[ghoomketu]

If Kerala can do it why can't other states like Bihar do it too? (Not asking rhetorically)

From what I see from the article the major gains were from investment in health and education which should be a no brainer.

[vishalontheline]

Not sure about Bihar, but talent / labor export isn't just a Kerala thing. Having a network does help - makes it easy to find a job, find people to live with that speak the same language, help in difficult times etc.

[blackoil]

Poor education at K-12 level. People from Bihar go outside but within India, to big cities like Delhi/Mumbai or farms of Punjab/Haryana.

[dartharva]

That's the same as asking "if Singapore can achieve near-zero levels of crime, why can't Brazil do it too?" i.e. a nonsensical question. The culture is different, the people are different and the mindsets are different.