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" ... To give examples: it has been true of oil in this past century. The first commercial quantities came from areas of Texas and Pennsylvania where a hollow pipe happered into the ground (I exaggerate, but not much) produced a gusher. A century later we were moving into the deep sea, the North Sea, the Arctic, to try and find those last few remaining megafields. So, that's how we think it normally works. Fracking for shale oil has of course rather changed that calculation. Oil is, to some extent, more like manufacturing now than it is like resource extraction. We don't need to find megafields, there's shale all over the place. Instead of having to spend $10 billion to bring Kashgan online (or fail to bring it online for that cost, as the case may be) we spend a series of $5 millions to drill fracking wells in plentiful shale. ... "