It's good, I'm not sure why I made it a 2 mark question lol was meant to be 4 marks, but if it was then:
First point - Say that deflation is when prices are lowered and this results in less expenditure and investment in particular. Since these are both components of aggregate demand, and since they have been lowered, economic growth would also lower. Since inflation is the opposite of deflation, it prevents it so it's a benefit because there would be economic growth with MODERATE inflation.
Second point - debatable whether it is a positive. Perhaps mention that this increased revenue has benefits such as increased expenditure on transfer payments/infrastructure or government expenditure (redistributed) which increases aggregate demand. This Increased aggregate demand --> increased multiplier effect on the economy (increasing equilibrium level of national income) and hence results in economic growth which is beneficial for an economy.
Someone correct my analysis if I'm wrong