Grin in the long run reaches store of value functionality + deterministic money supply (inflation) provides assurance/expectations around that. Early on speculation but SoV feature there4 it can become digital money.

Inflation in the early years (first 4 yrs) is exactly -the same- as bitcoin's btw, but SoV in much longer term.

See here I read it twice already https://medium.com/@CryptoProfG/grin-money-explained-4-exploring-grins-monetary-model-e48b1761653