In Chapter 3, Scoping a Game Project, we described gacha as an extreme method of randomized reward distribution. We also mentioned the Japanese origins of gacha, the gachapon toy capsules distributed by various vending machines.
What originated in the East is now a common practice in the western market, especially on mobiles. But before you base your Free to Play economy on loot boxes, you have to fully understand the requirements and implications of such systems.