If Substantial Income Mobility Is Present

If substantial income mobility is present,

A) there is considerable movement of individuals up and down the income ladder when income comparisons among the same individuals or households are made at different points in time.
B) annual income data are an accurate indicator of the long-term economic status of individuals and families.
C) the rich tend to stay rich and the poor tend to stay poor.
D) individuals and families move quite often among the geographic regions of a country but not among income groups.