A specific data pattern is characterized by a very long historical period where a variable shows almost no change, followed by a recent, sharp, and sustained upward turn. Consider two variables: (1) global gross domestic product (GDP) per person and (2) the number of hours in a day. Analyze why this specific pattern applies to one of these variables but is nonsensical for the other. In your explanation, identify the fundamental driver behind the sharp upward turn for the variable that exhibits this growth.