  We examine the fixed point behaviour of Yukawa couplings in supersymmetric
theories with varying numbers of dimensions. We show that Pendleton-Ross fixed
point behaviour is greatly amplified in the MSSM with no extra dimensions and 4
extra $5+\bar{5}$ multiplets or the MSSM with one extra large dimension and 3
extra $5+\bar{5}$ multiplets. We also show that power law running in models
with large extra dimensions can give a hierarchical set of quasi-fixed points
for the Yukawa couplings in a manner which is similar to the Froggatt-Nielsen
mechanism. However, we also point out the limited perturbative domain in models
with power law running
