Nvidia's wild stock swings put AI rally stamina in spotlight

(Bloomberg) — Big swings in Nvidia Corp. (NVDA) shares have reignited debate about the staying power of the chipmaker's rally. While the stock's valuation and threat of competition are major concerns, one variable is key: durability of demand. Most Read from Bloomberg For more than a year, Nvidia's customers have been snatching up all of the AI accelerator chips the company can produce. That fueled a doubling in Nvidia's revenue in its last fiscal year to $61 billion and sales are projected to nearly double again in the current period. To bullish investors, that spending is only just beginning as…