I want everything (s(+1),q(+1),s,q,e) to be zeros until some time, say, period 3. In period 4 e becomes 0.01 in peiod 4 and again 0s in all other periods and the difference s(+1)-q(+1) starts increasing. Then in period 8 again everything becomes zeros.
This equations describes the boom-bust asset bubble.
How to mode this process in Dynare?