Modeling the tax burden on reduced GDP

When a player is paying down debts and cutting services to create a surplus. People should be doubly upset, as they are being taxed and not even getting a service in exchange.

I have also noticed that when I turn political capital off, cut taxes to zero for a short period of time, while increasing expenditures, my gdp shoots up sky-high in one turn, is this realistic? Having both extreme supply and demand policies at once, would it boost my gdp through the roof in real life?