  By following previous work on this subject, we investigate the issue of the
instability of the electroweak vacuum against the top loop corrections by
performing an accurate analysis of a Higgs-Yukawa model. We find that, when the
physical cutoff is properly implemented in the theory, the potential does not
exhibit any instability. Moreover, contrary to recent claims, we show that this
instability cannot be understood in terms of the very insightful work of Wu and
Weinberg on the non-convexity of the one-loop effective potential of a scalar
theory. Some of the theoretical and phenomenological consequences of our
results are briefly discussed.
