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Although Kāru are made from corn, the most popular snack products in Japan are made from potatoes. In a TV Asahi poll of the top 30 most popular snacks, almost half were potato-based, including the top two. It thus came of something of a shock to many Japanese snack fans when a potato shortage was announced in April due to typhoon damage to crops in Hokkaido last year. The result was that number one producer Calbee halted production of some of its most popular products, leaving spaces in convenience stores and supermarkets as people rushed to stock-up. Prices of some products, such as Calbee's pizza-flavoured crisps, reportedly went for six or seven times the original price in online auctions. [UPDATE: These went back on sale on June 19th!]
This may all seem rather inconsequential, but as with the butter shortages in 2014 and 2015 (with signs in the supermarket asking customers to limit themselves to one pack), it points to a more important point: Japan is rather protectionist and foreign imports (whether potatoes or butter), though not banned outright, have to deal with a lot of red tape to reach the market. The intention, of course, is ultimately to protect domestic producers. Corn, however, is widely imported, though this doesn't help Tokyoites who will soon need to ask their Kansai friends if they want to "find Kārl"!