Injections are assumed in the Keynesian model to be exogenously determined. Based on this, which of the following statements is false?

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In the Keynesian model, injections are considered to be exogenously determined, meaning they are determined outside the model and not by the model itself. While it's true that injections are assumed to be constant with respect to changes in national income (A) and are represented by a horizontal line in the 45° line diagram (C), stating that injections are constant with respect to time (B) is false. In reality, injections can vary over time due to policy changes, economic conditions, and other factors external to the model.

Injections Are Assumed in the Keynesian Model to Be Exogenously