  We study analytically one-dimensional interacting spinless fermions in a
Fibonacci potential. We show that the effects of the quasiperiodic modulation
are intermediate between those of a commensurate potential and a disordered
one. The system exhibits a metal-insulator transition whose position depends
both on the strength of the correlations and on the position of the Fermi
level. Consequently, the conductivity displays a power law like size and
frequency behaviour characterized by a non trivial exponent.
