US shale gas economics are captured in this data-file, requiring a $2.5/mcf hub-level gas price, for a 10% IRR, on a large, $17M shale gas well in a basin such as the Marcellus. The marginal cost for unlocking c3% pa production growth from key shale basins is likely in a range of $3-4/mcf, but the evidence for cost reinflation is relatively mild.