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密切关注研发费用的趋势——如果一家公司的研发投入连续三年下降,不管它讲的故事多动听,都要亮红灯。
Watch the trend of R&D spending closely. If a company's R&D spending has been declining for three consecutive years, no matter how good the story sounds, it's a red flag.
📖出自《《保守型投资者安枕入睡》 (Conservative Investors Sleep Well)》(1975)