What were some problems that the crusades faced?

How can changes in technology or consumer demand make it difficult for people to get jobs? by changing the number or kind of jobs available by making it possible for some people to work fewer hours by making it difficult for people to buy what they want by creating a demand for things that are not available

Population parameters are difficult to calculate due to

Acharacterized by intimate, long-term, face-to-face association and cooperation. primary group community clique secondary group