The HBAR Economics whitepaper can be found with Hedera's other whitepapers here: https://www.hedera.com/papers
This paper describes how hbars are used on the Hedera network, their role in achieving consensus on and securing transactions, and a detailed expected distribution of Hedera’s fixed supply of 50 billion hbars. The information presented herein is provided for informational and illustrative purposes only and remains subject to change.