Sell after several days when it rises to the price you bought or more

there is something I don't understand in the #P2P if they say that one can save so that the money does not devalue in Venezuela then why when I buy #USDT at a price and at the time of selling it has to be lower than how I bought it, where is the economic stability???

If someone can help me #Ayuda to understand I would appreciate it very much