Adjust выпустил Mobile Shopping Apps report 2019. С такими данными стоит знакомиться, чтобы прокачивать свой навык educated guess.

Среди хайлайтов отчета:
- User acquisition costs and conversion rates
- Engagement by shopping app sub-categories including brand commerce, marketplace and value-add apps
- Global, regional and country-specific seasonal trends
- Deep dives in shopping app engagement trends in the U.S., Germany, the U.K., Japan and Indonesia
- Trends from across the globe, with highlights from four regions and five key countries

https://www.adjust.com/resources/ebooks/mobile-shopping-apps-report-2019/