This paper applies a portfolio approach to examine the effectiveness of the
Financial Institutions (FI) Code (1992) in achieving the twin regulatory o
bjectives of stability and efficiency in Australian credit unions. A model
is developed to examine the allocation of credit union portfolios in unregu
lated and regulation-constrained environments. The impact of regulatory con
straints on portfolio performance prior to and following the introduction o
f the FI Code is thus assessed. The paper concludes that, overall, the FI C
ode increased both the stability and the allocative efficiency of credit un
ions over that of previous regulatory regimes.