C. Keep records of trade. The quipu was made of knotted string and the Incas would keep records of birth, death, and harvests.
Earthquakes and tsunami sometimes mountains form
Athen's was close to the sea so it was easy to trade with others
The law of supply and demand is an economic theory that explains how supply and demand are related to each other and how that relationship affects the price of goods and services. ... However, when demand increases and supply remains the same, the higher demand leads to a higher equilibrium price and vice versa
