  Related to the electronic structure of cuprate high-Tc superconductors there
are two prevailing views: In one view, Pines and collaborators argue that
cuprates consist of two electronic subsystems: one with localized spins and the
other having itinerant character. Contrary to that, Phil Anderson has argued
for one-component or one-band model for cuprates. Thus, a very natural question
arrises: What is the actual electronic system in cuprates? Are these
two-component or one-component systems? After a careful consideration of both
the views, we argue in favor of one-component or Andersonian view. The key lies
in the dual character of electrons in narrow d bands, and we put forward a
semiclassical model using which we could quantitatively account for oxygen NMR
shift data in $La_{2-x}Sr_xCuO_4$ within the single component view.
