 About a square mile of lower Manhattan suddenly was lit by electricity. You think of Edison the inventor, but even more important is Edison the businessman. At the time, buildings in lower Manhattan were running off gas lights, and Edison knew that was who he had to beat. So he spent a lot of time thinking about economics. Yeah, well, he did. In fact, if you look at his notebooks, constantly he's going through and comparing the cost of what he's doing to what the cost of a gas system is.