In short there is new steem/money printed each day and distributed to authors, commentors and curators.
This gets a bit more in depth:
https://steemit.com/steem-help/@sykochica/answering-common-questions-where-does-the-money-come-from
In short there is new steem/money printed each day and distributed to authors, commentors and curators.
This gets a bit more in depth:
https://steemit.com/steem-help/@sykochica/answering-common-questions-where-does-the-money-come-from