A very interesting mechanism added to the testnet, similar to the Price slippage in AMM, according to the demand of options and for the security of the pool.
(1) If there are more calls than puts in FPO, calls will be more expensive;
(2) The higher the utilization of the collateral in the pool, the more expensive the options will be;
1\ MASP model creates one pool against all options. To fully mitigate risks in the pool, the options need to be as diversified as possible. Risk neutral is the goal. Therefore, a balance of puts and calls needs to be achieved. An interesting parameter added into the BS formula for pricing options. The over-purchased type of options will be more expensive, hence discouraging the buyers of this kind.
2\ The more options written, means the higher demand for options and higher potential risks for the pool. Higher demand normally means higher price. Therefore, the said parameter adjusts the option pricing according to the utilization ratio of the collateral. The more occupied for collateral in the pool, the more expensive options will be.
See how the unit price for ETH calls changes as the purchasing amount goes larger.