I’m not sure if this qualifies as a shameless plug or not, but it is certainly a plug for a piece I’ve written over on EoinPurcell.com:

These sales are starting, slowly but surely, to leak sales from small markets to large markets. The levels are unquantifiable right now in anything but the most sketchy way, but they are surely growing with each Kindle,  Kobo reader, iPad, iPod Touch, iPhone and Android device sold into a small market. The proliferation of devices offering ebooks sold through large market retailers  MUST be driving sales from those markets. When those retailers start sharing their data and how likely is that we will know for sure.

via The Differential Rates Of Digital Change Problem | Eoin Purcell.