The two word term that describes both a room whose walls reflect sound and an area in which someone's own ideas are reflected is : Echo chamber in other translation, echo chamber means a belief that reinforced by a defined system
Two problems sailors faced before the 1400s was they did not have good ways of knowing where they were if they got beyond the sight of land. And 2 the maps were poor and the risk ships were to slow to mak long voyages
The investment is the term which refers to the formation of the productive capital by using the flow of resources in the economy.
The main objective of the investment is that it generating the income so that we can use that specific income for the future use with some profit.
According to the given question, in economics the investment is basically form the capital within the economy and it also maintain the growth of the economy.
