What materials did the Inca use to build suspension bridges in the Andes? They wove wool and cotton to make rope bridges.
They cut trees from the Amazon to build wood bridges.
They dug rocks out of the mountains to build stone bridges.
They brought sand and cement from the desert to make brick bridges.

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .

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