RDP 2010-01: Reconciling Microeconomic and Macroeconomic Estimates of Price Stickiness Equation (A12)

m_{i, t}^{d} = {(\sum_{j^{'} = 1}^{N} γ_{j}^{\frac{1}{ε}} {(m_{i, t}^{j^{'}, d})}^{\frac{ε - 1}{ε}})}^{\frac{ε}{ε - 1}}