For these claims to hold, sellers' costs per unit must decline with the number of units sold.
The number of units sold dropped by 1.2%, as falling sales of cassettes and singles outweighed growth in compact discs.
If there is more than one price, the separate totals are added and the resulting money gross divided by the number of units sold.
In the second quarter, for example, the Macintosh captured a 15.8percentt share, almost double its share of the number of units sold.
Meanwhile, British artists didn't fare as well when it came to digital singles, for which the number of units sold was down 4.2%.
UPCs encode individual products at the stock keeping unit (SKU) level, allowing a manufacturer or retailer to track the number of units sold during a specified time period.
In total, the company's non-smartphone division reported a 27 percent drop in the number of units sold, to 53.7 million, compared with the same period last year.
The number of units sold fell by 11.2% from a year earlier, and the stock of unsold homes reached its highest level since 1993.
The company said that the number of units sold would fall for a second consecutive quarter because of lower-than-expected sales in the United States of Simply White, a whitening gel for teeth.
Software sales in the computer and video game industry reached $7.4 billion in 2006, nearly triple the same figure 10 years earlier, and the number of units sold exceeded 250 million, up from 74 million in 1996.
Prosecutors also saw potential fraud and larceny charges,applying a legal theory that, by overstating the number of units sold, the Trumps were falsely inflating their value and, in effect, cheating unsuspecting condo buyers.
