  For superpartner masses not much heavier than the weak scale $M=M_{\rm W}$,
large logarithmic corrections of the Sudakov type arise at TeV energies. In
this paper we summarize recent results of supersymmetric (susy) electroweak
radiative corrections for sfermion and charged Higgs production at $e^+e^-$
colliders in the MSSM. The results are given to subleading logarithmic (SL)
accuracy to all orders in perturbation theory in the ``light'' susy-mass
scenario. Prospects for the determination of $\tan \beta \geq 10$ are discussed
which is independent of soft susy-breaking terms to SL accuracy.
