Nvidia stock was off again as its Monday tumble extends into Tuesday. The shares were down 3% at $110.65 after falling 8.7% on Monday to closing at the lowest level since Sept. 18. Among other chip makers,

Why Nvidia’s longer-term future return is not worth the risk — even if it continues to be a phenomenally profitable company. Nvidia Corp.’s market performance over the past six months is a good illustration of the difference between a good company and a good stock.