What would your weekly supermarket run look like if you had a billion in the bank? For oil magnate T. Boone Pickens, grocery shopping is less extravagant than you might expect: composing a strict shopping list and taking no more cash with him than the list dictates. The billionaire applies more discipline to his big shop than most of us despite a financial buffer zone that would cover 300,000 jobseeker’s allowances for a year. Of course, what he writes on that list may well be astonishingly expensive, but the point is that Boone – like many others among the rich and famous – does not use his infinite chequebook as a license to splurge. – These people are FRUGAL!