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Published online by Cambridge University Press: 14 August 2015
The aim of this paper is to summarise the dynamical constraints on the contribution of low luminosity stars. Important restrictions come from disk stability and the Oort Limit. These are reviewed elsewhere in these Proceedings in the contributions from Sellwood and Binney. Here, our attention is concentrated on two further pieces of evidence - constraints from (1) the stochastic heating of wide binaries and from (2) microlensing.