When it come to sales & you want to achieve more, it is critical that you learn how to communicate your product as a solution to the customer & be genuinely interested if your problem is a fit for them.
You never want to assume the customers thoughts as you are fact finding to address their needs. These sales skills are essential. Your Customer has to have the incentive to own your product because you have shared with them threw the right sales science. This means your Techniques must be a non pressured approach.
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The science of sales is always about the customer & meeting their needs & not you getting the sale. This is true Business ethics.