For the IS/LM curves, why does the IS curve shift up when government spending increases? If government spending increases, then saving decreases so wouldn’t the IS curve shift up because people invest more

For the IS/LM curves, why does the IS curve shift up when government

spending increases? If government spending increases, then saving decreases so wouldn’t the IS curve shift up because people invest more?

I have trouble understanding the logic for the shifts in the IS curve.

 
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