Where do baking rewards come from?

TezosTezos
$1.88
3.30%
self.tezos1m ago
Is this a built in inflationary mechanism in the tezos block chain or is it produced from some other aspect? I want to know from a economic perspective what this interest is and where it comes from? Will it continue? What would make it stop suddenly? How does it compare to say Solana for example? Or algorand and Neo where their interest just stopped after a while.