The current sales trend, they said uniformly, is good enough not to require any additional price promotions.
Book publishers themselves piece together information about sales trends from a patchwork of sources.
But until recently, market research did not comprehensively track ethnic sales trends.
However, over the longer term, decelerating sales trends will eventually catch up.
At one time, it was the food companies that provided stores with information on sales trends.
But this year, to widespread surprise, the sales trend has turned downward.
If the sales trends are leveling off, however, prices still appear set to fall further.
And sales trends this year have also not appeared to favor energy conservation.
Judging from recent sales trends, the marketing message has proved effective.
Next, take a look at Apple's sales trends over the last few years.
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