I_SV is effected by Staking rate. If we put other factors aside, the higher the Staking rate is, the more secure a system will be, and vice versa. The higher the Staking ratio, the lower the liquidity of the token. In FIS design, the inflation rate will dynamically be adjusted to the proportion of Stake. When the proportion of Stake increases, the system will reduce motivation. Otherwise, the motivation will increase. During the repeated adjustments, StaFi protocol explored an ideal Stake ratio of 50%, that is, when the Stake ratio exceeds 50%, the incentive will no longer increase,and I_SV is between 2.5% and 10%. The motivation curve is as follows. The further issuance ratio is 10% in the first year. If the staking rate is below ideal, the excess rewards will be transferred to Protocol Treasury.