In 50 years running a cafe in Tokyo, Shizuo Mori can't remember a time when his coffee supplies cost this much.

The 78-year-old, who owns Heckeln, an old-school coffee shop in Tokyo's Toranomon business district, says the wholesale cost of his main product has surged 5% in the last three months.

That is a jolting experience for a country where weak growth has meant that prices of many things — including wages — haven't risen much in decades.