That is what they call “stability”
My Coke machine at work has been at $1 per can for a few years, at least. When did it go to a quarter? I feel like it hit that in the sixties, maybe the seventies, when I was humming along on a few K per year. I got a real job and I thought I'd be rich. Funny thing about that.
You know, back in the eighties I recall someone with a chinese background, shall we say, marveling at a conversation she heard from a woman saying her daughter was selling Girl Scout cookies, just like she had done. This was unimaginable stability to her. In China this amount of time represented the lapse of ages.