Their explanation reminds me of the old joke about the three college professors stranded on a desert island, a chemist, physicist, and economist. They discover a can of beans washed up on the beach and begin arguing over how to open it.
The chemistry professor says, "Just leave it out in the sun. Eventually, the chemical reaction inside will create enough pressure to rupture the can."
The physicist says, "That would take too long. Let's look for a rock with sufficient hardness to pierce the can when struck with sufficient velocity."
The economist says, "You guys are doing it the hard way. Let's assume a can opener."
As a former economist, I can attest there is some truth to the joke!
