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Polkadot: Constant yearly emission (#471)
Sets the inflation to ~120M DOT per year as specified in [Ref 1139](https://polkadot.subsquare.io/referenda/1139). 15% of that goes to the treasury and the rest to stakers. ## Details This MR sets the Polkadot inflation to a fixed amount per year. The yearly increase is ~120,063,259 DOT. The amount was set to 8% of the Total Issuance at block [22810263](https://polkadot.statescan.io/#/blocks/22810263) in which referendum [1139](https://polkadot.subsquare.io/referenda/1139) was executed. You can check this for yourself: <img width="1414" alt="Screenshot 2024-10-08 at 16 51 07" src="https://github.com/user-attachments/assets/3254f706-c53f-44c2-8ab7-75f08b9ce3f8"> Multiplying this by 8% and converting to DOT is about **`120,093,259` DOT per year**. This results in an emissions of `120,093,259 / 365.25` about **`328,797` DOT per day**. The Total Issuance and yearly inflation look like this over the next 25 years: ![inflation](https://github.com/user-attachments/assets/32572833-0a62-4823-9b7e-00350fcf1b9d) <details><summary>Concrete numbers</summary> <p> ```pre Initial 1.501 BDOT Year 1: 1.621 BDOT +7.407% Year 2: 1.741 BDOT +6.897% Year 3: 1.861 BDOT +6.452% Year 4: 1.982 BDOT +6.061% Year 5: 2.102 BDOT +5.714% Year 6: 2.222 BDOT +5.405% Year 7: 2.342 BDOT +5.128% Year 8: 2.462 BDOT +4.878% Year 9: 2.582 BDOT +4.651% Year 10: 2.702 BDOT +4.444% Year 11: 2.822 BDOT +4.255% Year 12: 2.942 BDOT +4.082% Year 13: 3.062 BDOT +3.922% Year 14: 3.182 BDOT +3.774% Year 15: 3.303 BDOT +3.636% Year 16: 3.423 BDOT +3.509% Year 17: 3.543 BDOT +3.390% Year 18: 3.663 BDOT +3.279% Year 19: 3.783 BDOT +3.175% Year 20: 3.903 BDOT +3.077% Year 21: 4.023 BDOT +2.985% Year 22: 4.143 BDOT +2.899% Year 23: 4.263 BDOT +2.817% Year 24: 4.383 BDOT +2.740% Year 25: 4.503 BDOT +2.667% ``` </p> </details> ## Implications 15% of the inflation goes to the treasury which results in a yearly treasury inflow of ~18M DOT (1.5M DOT per month). Stakers will receive ~102M DOT per year (~8.5M DOT per month). --------- Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
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