  We provide a mechanism to obtain multiple inflection points for the inflaton
potential based on the Coleman-Weinberg potential. The key ingredient is the
existence of zeros of the inflaton quartic coupling beta function, which can be
simply realized by a sign change of a gauge coupling beta function at a massive
threshold scale in gauge-Yukawa models. A universal inflaton potential emerges
for a wide range of models and can accommodate the experimental data in the
small-field inflation scenario. While the ratio of tensor over scalar
amplitudes is predicted to be small, the running of the scalar spectral index,
$\alpha_s$, has branches with both positive and negative values. The positive
branch with $\alpha_s \gtrsim 0.002$ will be tested by the coming cosmic
microwave background experiments.
