What was the short term cause of- These were rare before the mini-­‐crash of March 1929. But when they did come, in the mini-­‐crash and in the Stock Market Crash of October 1929, margin calls ensured that more stock would be sold as brokers tried to make back some of what their clients owed them. The volume of stock sold in October 1929 created the Crash.

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.