Intelligent question. You should join us over on Telegram community chat t.me/bitshares_official

See this also https://bitsharestalk.org/index.php?topic=24259.0

There is no inflation rate, however, BTS is emitted at a fixed rate and has a hard cap of 3.6b tokens that will ever be total circulation. A certain amount of BTS (blocks) produced are set aside as reserve pool, this pool is used to pay for work and maintenance for improvement, and to keep the blockchain running. This work is claimed in the form of 'worker proposals. What is unused and unspent from the budget, is burned. Burning reduces supply and thus puts inflationary pressure on the price.

Disclaimer: All from top of my head, with brevity for time spent making a steem comment, open to any corrections ....