Rooted in a reasoned understanding of what it is to be a human being in com
munity, Catholic social principles are accessible to a pluralistic, even se
cular, audience. Instead of being used separately in an ad hoc manner, thes
e principles can be applied as a single analytical framework in examining e
thical questions. Doing so allows the manifold dimensions of social problem
s to surface. The paper applies this framework on the issue of whether curr
ency markets ought to be taxed in order to deter speculation.