coffee consumed per capita P the relative price of coffee per pound (1967$) I per capita PDI

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coffee consumed per capita P the relative price of coffee per pound (1967$) I per capita PDI (000s 1967$) P the relative price of tea per quarter (1967$) T trend T1 for 1961Q1 T66 for 1977Q2 D1 for the 1st quarter D2 for the 2nd quarter D3 for the 3rd quarter ln natural log