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Fig. 4 | IZA Journal of Labor Policy

Fig. 4

From: Has the wage Phillips curve changed in the euro area?

Fig. 4

Country-specific evidence of instability of the unemployment parameter in wage Phillips curve. a \( {\Delta}^4{w}_t={c}_t+{\sum}_{i=1}^h{\beta}_{it}{\Delta}^4{w}_{t-i}+{\delta}_t{E}_t\Delta {p}_{t+1}+{\gamma}_t{U}_t+{\varepsilon}_t \). b \( {\Delta}^4{w}_t={c}_t+{\sum}_{i=1}^h{\beta}_{it}{\Delta}^4{p}_{t-i}+{\delta}_t{E}_t\Delta {p}_{t+1}+{\gamma}_t{U}_t+{\varepsilon}_t \). The blue lines are 16th, 50th and 84th percentile from time-varying parameter model. The red line is OLS estimate from constant parameter model estimated over period 1999Q1–2015Q4

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