Knowledge, time and abundance 

We buy things with money, but we really pay for them with our time.

In this video, Dr. Gale Pooley clarifies that the true price of something is the time it takes to earn the money to buy it. We can convert a money price to a time price by dividing the money price of a product or service by hourly income. It is the change in the time price over time that reveals the growth of knowledge.