This part was particularly interesting: But over the past couple of years, flash sales on the whole have faded in popularity as retailers saturated customer e-

This part was particularly interesting: But over the past couple of years, flash sales on the whole have faded in popularity as retailers saturated customer e-mail inboxes with promotions and less high-end excess inventory became available. I wonder how far reaching this 'Groupon-effect' is for Ecommerce in general.