It's simple math. A flat tax means the cheapest beer goes up the most percentage wise. For example, a beer that costs 6 shekels now will cost 8 shekels. That's a 25% raise. By contrast, a 16 shekel beer will cost 18 shekels, a 12.5% raise. And a 40 shekel beer will rise just 5%. The numbers quoted in the article are either wrong, or suggest that the big makers will give up most of their profit to keep their price low. I doubt that, but even if so, most people are either casual drinkers, in which case the cheapest beers won't be cheap enough anyway (that's what happened with me already, for example), while connoisseurs will continue to prefer to lay out the big sheks to get their favorite drafts.
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from the article: Israeli beer lovers foaming over rising brew tax