After Hong Kong photographer Jacky Lau Kin-sang upgraded his camera systems a few months ago, he was shocked to find professional, high-capacity SD memory cards for the set-up cost up to HK$3,000 (US$383) each, three times more than expected. But the real shocker for the 42-year-old was that the price of the hard disks he had been purchasing for years to back up his clients’ images also skyrocketed from HK$1,880 to HK$3,880 for a model with a capacity of 16 terabytes (TB). “It means you...