Saifedean explains it better than I can in The Fiat Standard.

But it's basically possible to earn a positive result with a money that apparently loses money by:

- Securing high quality debt (as in, low rates, long terms, little or no collateral needed).

- Running a business that can update its prices with inflation easily.

- Buying real assets that will keep up with inflation.

On a micro scale: an Argentinian taxi driver might earn more money buying a car with an auto loan that actually running the service, because inflation shrinks his debt and makes the car increase in value in nominal terms.