  We identify a new mechanism in supergravity theories which leads to
successful inflation without any need for fine tuning. The simplest model
yields a spectrum of density fluctuations tilted away from scale-invariance and
negligible gravitational waves. We demonstrate that this is consistent with the
observed large-scale structure for a cold dark matter dominated, critical
density universe. The model can be tested through measurements of microwave
background anisotropy on small angular scales.
