The model of IFQI has many advances, such as explicit mechanism, few independent variables, simple and intuitive, having positive relative with yarn strength and spinning consistence index and so on.

IF QI模型机理性强、自变量少、形式简单直观，而且与单纱强力、纺纱均匀指数呈正相关。

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Using a simple model, which adjusts the Big Mac index for differences in countries' GDP per head and relative labour costs, gives the result that the yuan is now less than 5% undervalued.

ECONOMIST: Economics focus: Burger-thy-neighbour policies | The