Effectiveness of Advertising in Different Media. The Case of U.S. Army Recruiting
利用1981-1984年美国陆军数据，估计电视、广播、杂志和报纸四种媒体的广告对征兵数量的影响，发现广告效果显著且媒体间滞后模式差异大，广告支出分配接近最优。
The U.S. military spends roughly $100 million annually to place advertisements to promote enlistments. Army data for 1981 to 1984 exhibit substantial cross-sectional and times series variation in advertising intensities, which enables estimation of advertising effects separately for four media (television, radio, magazines, and newspapers) using a functional form allowing media-specific, S-shaped response functions and relatively flexible, media-specific lag structures. We find that army advertising was very productive in producing enlistments; response functions for television, radio, and magazines are consistent with widespread advertising practice; lag patterns differ substantially over media; and the army's allocation of spending across media was nearly optimal.