Pricing cues such as sale signs and prices that end in 9 are more influential, when A. consumer price knowledge is poor.
There is a pricing cue where prices are made to end in 9 such as $0.99 or $12.99 and the reason for this is that there is psychological evidence that people feel the good is cheaper.
This is not effective when the consumers have a poor knowledge of the prices of the goods because if they did, they would not be fooled by the 9.
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