Compared to other fiats quite possibly, but compared to synthetic baskets other than fiat, much less clear. Different people's profiles of expected expenses are different. Some are regular individuals and families, some are running businesses. Some spend mainly on food, medicine and housing, others on AI tokens. Some have children, some don't. Some live in large cities with spiking rent prices, others in the countryside. USD or any single fiat is far too homogeneous to effectively provide price stability to all these groups.