If an increase in investment spending leads to a rise in real GDP, which of the following is the most likely underlying cause of this relationship?

When people or businesses invest more money, such as by buying new machines or building new factories, this spending creates jobs and increases production. As companies expand and hire more workers, these workers earn wages, which they then spend on goods and services. This increase in spending by both businesses and consumers leads to a rise in real GDP, which measures the overall economic output of a country. For example, if a car manufacturer invests in a new assembly line, it might hire 100 new workers, who will then spend their earnings in local shops and restaurants, further boosting the economy. Thus, the initial investment spending starts a chain reaction that raises the overall economic activity represented by GDP.