At the onset of the Great Depression in the early 1930s, money supply . increased because inflationary pressures caused a drop in production relative to demand fell because both the currency-deposit ratio and the reserve-deposit ratio increased fell because the Fed dramatically reduced the monetary base increased because both the currency-deposit ratio and the reserve-deposit ratio declined

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.