It has helped develop the nation by allowing faster transportation of materials needed to colonize.
"They resulted in military victory over Islamic society" was technically not one of the ways in which the Crusades benefited European society, since this conquest had no major positive repercussions.
A high inflation rate is most difficult for people of a low socio-economic standing. The reason for this is the fact that people which a low socio-economic standing have the lowest income and for that reason, the amount of money which they're receiving gets lowered through inflation.
