The whole idea

of the marketing and sales is to play with the psychology of the consumers.
 In any campaign,
 efforts should be made it make it so influential that the decision making of the customer
 is totally in the favor of the company.

Did You Know that there are some tricks to manipulate the mind of the consumers,
which can be utilized by not only ordinary sales person,
but can be used by larger firms.
Although they are used unknowingly, there is no set list.
 

Mutual exchanging is the first and powerful trick.

 The company can start with giving something for free to the customer.
He will take it for the first time,
 but from next time he will feel obliged and will try to return the favor.
Offering the product for free initially can do this.
And if the customer is satisfied with the product,
he will buy it for himself from next time.
 Some salespersons get confused with this principle.
 For example, it is ineffective and wrong according to this principle,
to quote ‘Spend over $25 and get a free t-shirt’.
 The offer is not free; the customer has to spend something to get the free product.
The product being given should be totally free without any condition to be fulfilled.
 For example, the line ‘Get the latest lipstick shade absolutely free’ will do the trick.
 If the shade is really good,
 they will buy it the next time and might even think of buying other shades of lipstick.