Big Mac price differences were even more pronounced in Shanghai: the full range of burger prices across China (10.5-15 yuan) could be found within that one province.

巨无霸价格的差异在上海更为明显：全中国汉堡价格的范围(10.5 ~ 15元)可以在上海一个地方找到。

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The Big Mac index is the Economist's burger-based measure of whether currencies are over - or undervalued.

巨无霸指数是《经济学人》以汉堡价格为基础来衡量一国货币是否被高估或低估。

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The global chain, whose best-known product is the Big Mac burger in a bun, says it will be its first vegetarian outlet.

BBC: McDonald's opens vegetarian-only restaurant

This offering relocates the innards of the Big Mac -- burger, pickle, special sauce, lettuce, cheese -- in a tortilla to create a small burger-burrito hybrid.

CNN: Fast food treat is shrinking

In Seoul, the Big Mac has to compete with Burger King's Whopper, Lotte Burger (a local rival) and South Korean alternatives.

ECONOMIST: Deflating