According to The Evolution of Useful Things, what caused the popularity of Post-it notes?

Question

a prior need for them
their varied styles
widespread availability
their varied uses

Answer 1

The popularity of Post-it notes was primarily caused by a prior need for them. The use of small, sticky notes addressed a common issue of needing to leave reminders and messages in a convenient and easily removable format, which filled a gap that many people were looking for in everyday office and personal life.