In this paper (https://www.sciencedirect.com/science/article/abs/pii/S0304387822001791) the authors de-trend their model’s variables by A^{\frac{1}{1-\alpha}} where A_t represents the level of technology or total factor productivity (TFP). I don’t understand how do they get the exponent {\frac{1}{1-\alpha}} ?

Thanks

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Thank you !