I think that resembles communism, house, food and transport is 75% of the average person and for the majority is the real goal in life. A fair UBI would reflect how much you contributed with your existence to the overall economy and that can only be your life. It is normal for a 18 y.o person to get a XX UBI while a 36 y.o person to get a 2x XX amount as the contributions are different. Also, the taxation should reflect the amount of consumption from the natural resources of each individual. For instance, a 18yo guy might be taxed way less than a 36 y.o guy who lives a luxurious life...
Either way, the totality of our time on Earth is finite and "inflation" comes only if the population is growing thus more production and consumption.