  The observables $T/S$ and $n-1$ are key to testing and understanding
inflation. ($T$, $S$, and $n-1$ respectively quantify the gravity-wave and
density-perturbation contributions to CMB anisotropy and the deviation of the
density perturbations from the scale-invariant form.) Absent a standard model,
there is no definite prediction for, or relation between, $T/S$ and $n-1$. By
reformulating the equations governing inflation we show that models generally
predict $T/S \approx -5(n-1)$ or 0, and in particular, if $n>0.85$, $T/S$ is
expected to be $>10^{-3}$.
