Why were the flagellants troublesome for many european cities suffering from the plague

Flagellants were religious zealots who would whip themselves in public as atonement for their sins.  They caused problems for cities during the plague because they would travel from city to city spreading the plague because they carried the bacteria with them. 

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.