It remains difficult to track sales of taxi-screen advertising.
The few that track sales do so through customer surveys, not retailer reports.
Generally, this data track sales only where the seller is represented by a real estate agent.
Thirty-eight other states have approved prescription drug monitoring programs that track sales.
Nor can New Jersey track sales by location to see which borders are the most porous.
However, as streaming rose, digital track sales fell by 12.5%, down to 964.8m units.
Besides, which, she said, "there's an inability to track sales for oversight and regulation," she said.
Large companies first bought SAP products to manage inventories, track sales leads and handle vacation requests.
(By the middle of 2010, digital track sales had declined 0.2 percent from the same period the year before).
As the president of Kliger Weiss Infosystems, Mr. Kliger sells data-processing services that help retailers track sales and inventory.
The association does not track sales of the units, but manufacturers say it is a very significant market.
