" Perhaps in a century or so we’ll look back on these boundaries the way we look back on slavery and apartheid today. One thing is certain however: If we want to make the world a better place, there’s no getting around migration. Even just cracking the door would help. If all the developed countries would let in just 3% more immigrants, the world’s poor would have $305 billion more to spend, say scientists at the World Bank.56 That’s the combined total of all development aid—times three. "

― Rutger Bregman , Utopia for Realists: How We Can Build the Ideal World