The document discusses Rehn and Lindkvist's hierarchy of trends which categorizes trends based on their scale and influence. The hierarchy includes:
1. Microtrends - Specific apps/games dependent on smartphone capabilities that often lose popularity over time. Examples include Korean skincare products and coffee shops catering to youth.
2. Macrotrends - Broader trends like smartphone brands and online shopping platforms that have widespread adoption. Examples given are iPhone vs Android and e-commerce sites.
3. Megatrends - Trends dependent on infrastructure like the internet and smartphones that are nearly universally adopted, such as climate change and aging populations impacting the Philippines.
4. Gigatrends -