The big four Japanese beer companies – Asahi, Kirin, Sapporo and Suntory – are in a constant turf war. Game theory keeps them intertwined in a fierce marketing dead heat, and the types of beer they release seem to be hamstrung by a monkey-see-monkey-do strategy and Japanese tax laws.

Over the past seven years, beer companies have produced cheaper and cheaper products by dancing around Japanese tax laws that define beer by barley content,  and politicians have continuously revised the regulations to combat deficits. Brewers first pushed happoshu, a low malt beer, through the tax loophole. Not surprisingly, the beer sold extremely well. Politicians modified laws in 2003 to tax happoshu, and brewers began to “third-type beers” such as Sapporo’s Draft One, which eschews all barley and uses fermentables from peas and corn instead. In 2006, politicians redefined these as “other fermented beverages” to bring them under tax laws.

As the law currently stands, 100% malt beer is taxed at ¥222 per liter, beverages with a barley content of 25-50% at ¥178, and those with less than 25% at ¥134.