Time is money
Fair enough, but then what's money? Some would say that it's "a medium that can be exchanged for goods and services and is used as a measure of their values on the market."
Others might say love. Now, if time is money and money is love, does time = love? Seems reasonable. But what if someone were to suggest that love is the killer app?
I'm sure that you can see where this is going...
NOTE: Links on the internet being about a stable as a house on Jello, you might find some of these no longer work.