What is the max supply of Decred?

Could you elaborate on the maximum supply of Decred? As a cryptocurrency enthusiast, I'm particularly curious about its issuance schedule and how it differs from other coins in the market. Understanding the maximum supply is crucial for assessing its long-term value and scarcity. Does Decred follow a fixed supply model or does it have a variable issuance rate? Additionally, how does this supply mechanism affect its inflation rate and potential for price appreciation? Your insights would be greatly appreciated.