WHEN APPLE cut its revenue estimate for the last quarter of 2018 because of unexpectedly slow sales of iPhones, markets convulsed. The company's share price, which had been sliding for months, fell by a further 10% on January 3rd, the day after the news came out. Apple's suppliers' shares were also hit. This week Samsung, the world's largest maker of smartphones by volume, which also sells components to other smartphone-makers, said its sales were weaker than expected for the quarter, too.
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