Read the original proposal on Discourse
RARI does not have an elastic supply or rebase mechanism. The token contract appears to be using the standard OpenZeppelin libraries.
RARI has a 25,000,000 fixed supply of which 4,079,788 are circulating.
The contracts and addresses with the highest concentration of RARI tokens are held by Proxy Contracts (rank 1,2,6), Sushiswap Pool (rank 8), MXC (rank 9), Uniswap Pool (rank 10), Arb bot (rank 7), Investor/Team (rank 3, 5) and weekly rewards distributor (rank 4).

Rarible is a software allowing digital artists and creators to issue and sell custom crypto assets that represent ownership in their digital work.
Of note, Rarible is both a marketplace for those assets, as well as a distributed network built on Ethereum that enables their trade without a middleman.
The tokens that creators generate on Rarible are known as non-fungible tokens (NFTs). Each NFT is unique, and unlike bitcoins (or other units of money), they are not interchangeable. This property is known as fungibility, which is why tokens on Rarible are called non-fungible. Examples of NFTs found on Rarible's marketplace include digital artworks, memes and even parcels of virtual land.
Central to the platform is RARI, Rarible's cryptocurrency. By owning RARI tokens, users can vote on proposals that affect the platform, moderate creators and curate featured artwork.

RARI is the native governance token of Rarible and is designed to reward active platform users -- buyers and sellers -- with the ability to eventually govern the marketplace.
RARI can be obtained by:
From a high level, RARI holders are entitled to:
There are 25 million RARI tokens created in total:
The Rarible team operates an official Twitter, Instagram, YouTube, and Medium account. The repositories for their code is hosted on GitHub. There is a governance Forum, Telegram, and Discord that's also available to their community.
The Rarible team is non anonymous and their founders have public profiles:
Founder: Alex Salnikov 1
Founder: Alexei Falin 1