As cryptocurrency miners process blocks of transaction data, new coins are generated. Cryptocurrencies are a new industry. Issuers want enough coins mined to satisfy new investors. New coins are mathematically designed to be turned out at a stable rate so that the value of the currency will remain relatively stable. Over time the mathematics of coin creation is programmed to end. The intent is to avoid over saturation of the market and prevent currency devaluation. Production of most cryptocurrencies will cease when are predetermined number, known as the mintage cap is reached. When the last coin is mined, there will be no more new coins.
Malone, J.A (2015). Glossary of Bitcoin Terms and Definitions. United States: Lulu Press, Inc