  We study the correlation of quantum effects on the ratios R_b and R_c within
the framework of the MSSM. While in the SM the quantity R_b is in discrepancy
with experiment at the 2 \sigma level from below, and R_c differs from the
experimental result at the 1.5 \sigma level from above, the theoretical
prediction for both observables could simultaneously improve in the MSSM,
provided that \tan\beta is large enough (\tan\beta\sim m_t/m_b) and there
exists a light supersymmetric pseudoscalar Higgs, and also a light stop and a
light chargino, all of them in the 50 GeV ballpark. In view of the masses
predicted for these SUSY particles, persistence of the `R_b-R_c crisis' in the
next run of experiments would not only suggest indirect evidence of SUSY, but
should also encourage direct finding of SUSY at LEP 200. We also point out the
consistency of this picture with other observables and the intriguing
possibility that this Z-physics scenario might allow getting a hint of SUSY at
Tevatron through the simple observation of t\to H^{+}b.
