#2. Which principle states "To provide the right book to the right reader at the right time"?
#3. Which principle states: "The best reading for the largest number at the least cost" ?
#4. Who gave the Demand and Supply Theory of Book Selection?
L.R McColvin advanced his Demand and Supply Theory of Book Selection in 1925
He states, “Books in themselves are nothing. They have no more meaning than the white paper upon which they are printed, until they are made serviceable by demand. The more closely book selection is related to demand, the greater is the resultant and possible service”.