docs: rfc-323 tari throttle

[CjS77]

TariThrottle is a simple process controller designed to modulate the layer two burn rate in order to achieve two
goals:

• Primarily, keep the emission and burn rate roughly balanced (ensuring long-term sustainability of Tari), and
• Secondarily, to maintain the total circulating supply at a target value (satisfying an implicit assumption in
  cryptocurrencies that token supplies are finite).

A proof-of-concept controller has been implemented and tested in a simulation environment ([repo]). As the results
below attest, the controller logic is sufficient to achieve these goals, even under highly volatile layer two fee
conditions.

However, the controller achieves the goals at the expense of a rapidly changing layer two burn rate, which may be
detrimental to the sustainability of validator nodes.

At the risk of the tail wagging the dog, the primary conclusion of this study is that the TariThrottle controller
should likely not aim to maintain a supply target, but instead to ensure a sustainable layer two ecosystem, to
whit:

• maintain a constant demand gradient so that under normal circumstances there is always a demand for new Tari and
  thus Minotari are constantly being burnt to satisfy this demand,
• marginal Validator Nodes are able to operate at or near break-even rates, while maintaining a healthy reserve of
  capacity for surge demand, and
• the supply of Minotari is sustainable over the long-term.

Therefore, the conclusion of this study is not to abandon the original targets of the TariThrottle completely,
but to adjust the priority of the primary goal (a sustainable long-term balance), and make it subservient to the
primary goal of ensuring a constant demand gradient.

A modified Tari throttle model that seeks to achieve these aims is outside of the scope of this RFC and is left for
a follow-up study.

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