If you're staying "stagnant" and the world is getting better, you're better off.
Even if you're declining, you can be better off.
If you think poor people in the US and Europe have it rough today, you should read up about what it was like to be a normal person in the 1600s in Europe.
If you think poor people have it rough today in California, you should read up on what it was like being poor in California in the 80s and 90s.
Etc.
The average lower middle class family today has it better off than nobility in the 1700s.
The fact that we're better off than people in the 1600s does not contradict what I wrote.
> The average lower middle class family today has it better off than nobility in the 1700s.
But in many countries is worse off than a couple of decades ago.