Consumer packs and dealer allowances

1) The case suggests that promotional activities (consumer packs and dealer allowances, among others) affect overall demand, and may be felt over an extended period. As a result, the effects of promotional activities are felt during the month of the promotion and up to two months after the promotion. Create columns showing one-month and two-month lags of consumer packs and dealer allowances. 2) Create a trend variable indicating the month of the time series (month 1 for January 1984 thru month 48 for December 1987).