The classic capacity formula C=W log (1+P/N_0W) of the point-to-point 
AWGN channel not only quantifies exactly the performance limit of 
communication in terms of channel parameters, but perhaps more importantly 
also identifies two qualitatively different operating regimes: power-limited 
and bandwidth-limited regimes, which guide the design of optimal communication 
schemes. We propose an analogous theory for large wireless networks. We show 
that depending on the operating regimes, either multihop, distributed 
heirarchical MIMO or a hybrid combination of the two is asympototically optimal.