income does really change to improve GDP or GNP

Okay, if the GDP of a nation constantly fall from the last few years how can GNP help to improve GDP. The method of collecting the tax from sales and from income does really change to improve GDP or GNP. The taxation rule for the month in winter in all winter state if goes lower and the rest month the same will it help to generate more liquid cash flow in the market to increase buying habit and maximize the deprecation through sale tax and gain a better GNP.
 
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