Living standards can be compared in terms of real GDP per capita, which historically in the United States has doubled every 35 years.
The GDP of the United States has doubled every  35 years.
The GDP of the United States has remained unchanged forever.
The brill farmer thought they were all sane.
Two children have an axe.
No will was left behind for her husband.
The athlete is performing a move.
People can have their wealth in the form of equity.
A guy getting ready to swim in the swimming pool