David McWilliams is remarkably productive. It’s Saturday morning, and I’ve just picked up a copy of his latest book, Money: A Story of Humanity, before settling down to peruse his latest weekly offering in The Irish Times.  Meanwhile, I’m also looking forward to the annual pilgrimage to his wonderful Kilkenomics Festival next month. Once again, he’s somehow enticed a storied cross-section of comedic and economic talent to share their thoughts amid the medieval alleyways of the Marble City. Of course, it’s not such a hard sell. The lure of hurling lore and rusty ale is timeless. For me, the highlight…