Let A and B be fields of subsets of a set X and let mu: A --> R and nu
: B --> R be consistent, bounded, finitely additive measures (i.e., ch
arges). We give necessary and sufficient conditions for mu and nu to h
ave a bounded common extension to A OR B. Conditions on A and B are gi
ven under which any bounded consistent charges mu and nu have a bounde
d common extension.