The effect of the saccharin warning label on sales of diet soft drinks was modeled with an
autoregressive integrated moving average (A RIMA) process. Retail price trends and
attendant publicity were modeled concurrently to separate these effects from those due to
the warning. Results indicated that the label produced a small yet statistically significant
reduction in sales, with an abrupt onset and, thus far, permanent duration. Reasons for the
absence of decay effects, limitations of interpretability, and ideas for improving future
evaluations of warning labels are discussed.
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