The tier of DesignatedDealer

I see that there is a tiers parameter in DD, which is used to limit the circulation, but why 4 tiers, can you introduce it?

Hi @kaige, thanks for the observation! We are introducing the notion of tiers for the mint process, in order to categorize different mint amounts. For example, if a Designated Dealer wants to mint a high amount of currency, it will fall into a higher tier which necessitates a higher number of approvals from association members.