Yet more importantly in the long-term for trade agreements, the ACCJ monograph pointed to a very simple and neglected point: follow-up.

FORBES: Lessons From Japan's Trade Policies

The carrier's quick to point out that its newly introduced slab is a follow-up to that LG Motion 4G we saw last year, and that it's compatible with those LTE plans which were unveiled earlier this month.

ENGADGET

You could point to something similar happening with Arkham City, a follow-up to the wildly popular Arkham City where players take on the role of Batman.

FORBES: DLC Running Wild: Preordering Paintball Mode

We don't know if Google will offer these extra-personal discounts to the public at any point in the future, but if you suddenly notice a lot of follow-up bargains in Google Play, you'll know how they came to be.

ENGADGET: Google patents buyer-specific price drops for follow-up sales, can tell if you're a cheapskate