What are shifters of demand?

Demand shifters include preferences, the prices of related goods and services, income, demographic characteristics, and buyer expectations. Two goods are substitutes if an increase in the price of one causes an increase in the demand for the other.

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.