See https://www.bloomberg.com/news/features/2024-09-03/usd-ars-argentine-peso-alternative-emerges-in-la-rioja-the-chacho?srnd=homepage-americas.

"Wait all the way till December, Quintela has told them, and the provincial government will pay them 1.17 pesos for each chacho, effectively an interest rate of 17% in pesos that, when annualized, comes to over 50%"