Economics cfa l1

The formula of keynision multiplier is 1/1-mpc(1-t)… Can anyone explain me when we subtract MPI from it… ie 1/1-mpc(1-t)-mpi

Are you seeing this in the curriculum?

If so, where, exactly?

It’s under the topic fiscal policy in the economics section

I’m not seeing MPI anywhere.

What page? Is it a numbered formula?