The Collector's Fallacy is the illusion that gathering books, articles, and bookmarks increases knowledge. In reality, knowing about something is not the same as knowing it.
Photocopying or bookmarking gives immediate tangible reward, like Skinner's doves pressing a button for food. The growing pile creates false comfort, but the content is never read or assimilated.
Without note-taking, knowledge fades quickly. Relying on short-term memory to shuttle information from source to project is inefficient. Permanent notes extend your mind and make re-reading unnecessary.
Eco recommends processing photocopies immediately. A cycle of research, reading, and assimilation should be kept short: research for one hour, then process until empty. This avoids waste and builds informed decisions.
Set a time limit for research (e.g., one hour), process all collected material, review the cycle, and adjust. Repeat to form a feedback-supported habit. The goal is to integrate knowledge permanently, not just store it.