Economics has given incredibly little attention to energy as an essential part of any economic production system. We talk about labor and capital, where's the energyand how do we think about the nature of energy? The irony is that in order to make his machine work, he had to go round the back and flip a switch and turn it on. He had to put energy in the system. Even that machine had a through flow of energy. And i always wished that if only, instead of plugging it into the wall, they'd had a student on one of those bikes where, you know, peddle away to generaten electricity. If a student had been powering it, you couldn't