Psychological number strategy, are they really needed?

are you ever see this kind advertising? sell $24 by now only $23.98 you can save two penny. or this kind? price $24 we save 2 penny for hunger children!

are this really needed?

in the fact is yes, as a consumer if i can save two penny and i bought it 100 pieces i will save $2 but in the second term the charity can also be an attractive strategy to take peoples hearts.

The fact!

peoples will search for substitute goods for a reason and they are :

they gonna search for a substitutes that cheaper and have the same quality, atleast.
they gonna search for the taste they like.
they gonna search for the trend.

so the psychological strategy can always use but the time for using this strategy will effect to.

What Strategy used by??

you ever heard the 13th rules of sun tzu, or the other art of war? but the big question is are you used it! all strategy gonna be a junk if we not used it. the fact is, the most use full strategy is what we used. cause it will get something.
all advertising need a cost. can be cheap or even very expensive. the cheap one and the expensive one is equal if the publishing company can do optimized work. what is the optimized word from a publisher!
that the commerce get notice by people. usually many publisher do a little research about the product. and guest what, the measure of success commercial still the rate of the sale.