Answer:
<em>Economic Trend indicator</em>
Explanation:
Trend indicators are things that consumers of goods and services act in response to their effects.
Maslow's hierarchy of needs centered on human motivation and satisfaction. According to Maslow, Psychological needs, safety needs, community and belonging, self-esteem and self-actualization needs must be attained starting from the most important which is psychological needs.
The aftermath of World war 1, lead to the great depression of the 1930s which was the worst economic meltdown the world had ever witnessed. Since the economic situation was bad it became extremely difficult for individual to meet up with psychological and safety needs. Prices of goods and services and people started reacting to this economic trend indicator.
The Great Depression of 1930s occurred because of economic problems, resulting in people reacting to economic Trend Indicator.
