Answer:
An increase in real GDP (gross-domestic product) per capita
Step-by-step explanation:
There has been an increase in real GDP since 1900. Data shows an increasing long-term pattern that accelerated, in a huge magnitude, in 1975, which means that GDP began to increase more than before. From 2002 to 2008, real GDP accelerated in a non-depreciable magnitude, but in 2009 there was a recession caused by the financial crisis and because of the explosion of the property bubble. Since 2009 until 2018, real GDP has been increasing.