Every individual in a nation has his or her own authority to determine what he or she can do with the income he or she receives. This behavior depends on the country’s economic categorization, whether it is a developing country or a developed country. For some developing countries, in which the incomes are relatively low, the people tend to consume more rather than to save whenever their income level rises. In contrast, the majority of people in developed countries tend to save more than to consume. The consumption pattern in every country is also different. People in developing countries spend most of their income to buy primary needs, while people in developed countries spend their income on consumption of secondary or tertiary needs. The people’s behavior on such countries, their propensity to consume or to save, affects the whole country’s economic condition because the people play a significant role in maximizing the country’s wealth. Based on Solow Growth Model, 100% savings rate will bring all income to be invested for long-run production. Meanwhile, when the rate is 0%, it implies that no new investment capital is created, so the capital stock will depreciate without any replacement. This makes the steady state unsustainable.