https://apnews.com/5c8f6edc8a354f4d88abf44109f26cb7 > NEW YORK (AP) — Stocks went into a steep slide Thursday morning after Apple reported a slowdown in iPhone sales over the holidays in China, a hugely important market for the company. > The rare warning from Apple sent a shudder through markets and confirmed fears among investors that the world's second-largest economy was weakening.