Money and banking econ class.

Consider the equation for the amount of (real) revenue that a government can raise through seigniorage:

G_t = (1 - 1/z)M_tV_t

a)Explain the two factors that limit the amount of revenue that a government can raise by printing money.

b)It there a parallel to be drawn with the amount of revenue that can be raised through taxation? What is that relationship called? Explain.

Reference - Modeling Monetary Economics (2016, Fourth Edition, Cambridge University Press) by Bruce Champ, Scott Freeman and Joseph Haslag.