If you were calculating a forecast using an exponential smoothing model,a calculation using α = 0.2 would be putting a greater emphasis on recent data,while a calculation using α = 0.8 would be putting a greater emphasis on past data.Thus a lower α is more responsive to changes in demand in the most recent periods.

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In exponential smoothing, a higher α (such as 0.8) puts more emphasis on the most recent data, while a lower α (such as 0.2) puts more emphasis on past data, making the forecast less responsive to recent changes.

If You Were Calculating a Forecast Using an Exponential Smoothing