Return on reading is is purely a reflection of quantity which rotates around time in a reflection of quality and pay a huge consideration to the Time Value of Books and to determine this you need to measure it on 3 things : Reading-based Reading which is a directionless reading, Threat-based Reading i.e. moving to addictive reading and Opportunity-based Reading where you acquire new knowledge, leverage on knowledge, and create new knowledge. How do you read?