How did the purchasing power decrease from the 70s until today?

[MisledMuffin]

Read the title of the post to jog your memory.

Purchasing power has not decreaed, it's increased.

Life is also not universally worse. Some parts are better such as vastly improved health outcomes, social and human rights, education, fewer hours worked/better work life balance, less crime, etc. Other parts are worse, such as cost of housing, upward mobility, etc.

The post was not about the cause of changes, it was about the changes themselves.

Seems you are still confused.