One of the main reasons why the XB1 did well in August through October and kept it close in November was because Microsoft strategically spaced out the bundles/SKUs:
Aug 2 - 2TB XBO S
Aug 23 - 1TB Madden 17 bundle, 500GB Halo Collection bundle
Sep 27 - 500 Minecraft bundle
Oct 11 - 1TB Gears 4 bundle, 2TB Gears 4 LE bundle
Oct 18 - Battlefield 1 special edition bundle
Oct 21 - 500GB Battlefield 1 bundle
Nov 1 - 500GB Gears 4 deep blue bundle
This was a very clever plan on Microsoft's part. Release a new SKU at the beginning of the month for an early uptick in sales and another near the end for a last moment boost before the NPD period closes. On top of that, that momentum can be carried into next month. I think the blue Gears 4 bundle contributed towards keeping the November margin small since (1) it only costed $299 which was cut down to $249 during BF week, (2) the majority of November's sales are dictated by price, and (3) the console is uniquely colored, but you didn't have to pay an extra cent.
