Let Pt denote the aggregate price level at time t. The inflation rate from time
t - 1 to t, denoted by τ , is defined as
τt =Pt - Pt -1 , Pt -1
(a) Write the first order homogeneous difference equation for the price level and solve it.
(b) If the annual inflation rate remains stable at 3.5 %, what is the aggregate price index after 10 years? (Hint: the initial price level is the price index at the base year).
(c) After how many years the price level doubles?