Assume there are no prospective investment projects (I) which will yield an expected rate of return (r) of 25 percent or more, but that there are $5 billion of investment opportunities with an expected rate of return between 20 and 25 percent, an additional $5 billion between 15 and 20 percent, and so on. The investment-demand curve for this economy is: 
Definitions:
Maslow's Hierarchy
A theory in psychology proposed by Abraham Maslow in 1943, which posits that people are motivated by five basic categories of needs: physiological, safety, love/belonging, esteem, and self-actualization, addressed in ascending order.
Cultural Values
The collective principles, norms, and ideals that shape a society or organization's behavior and beliefs.
Self-Actualization
Bringing to fruition one's natural talents and possibilities, viewed as an essential impulse or requirement inherent in everyone.
Goal Difficulty
Describes how challenging a set goal is to achieve, which can influence motivation and effort levels.
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