That’s how quickly the fortune of the Waltons, the clan behind Walmart Inc., has been growing since last year’s Bloomberg ranking of the world’s richest families. At that rate, their wealth would’ve expanded about $23,000 since you began reading this. A new Walmart associate in the U.S. would’ve made about 6 cents in that time, on the way to an $11 hourly minimum. Even in this era of extreme wealth and brutal inequality, the contrast is jarring. The heirs of Sam Walton, Walmart’s notoriously frugal founder, are amassing wealth on a near-unprecedented scale — and they’re hardly alone.