RDP 2013-10: Stochastic Terms of Trade Volatility in Small Open Economies Equation (C2)

ω_{i}^{i} = \frac{p (q_{t} | q_{t - 1}, σ_{q, t | t - 1}^{i}; Ψ)}{\sum_{i = 1}^{N} p (q_{t} | q_{t - 1}, σ_{q, t | t - 1}^{i}; Ψ)}