Selling comes down to providing value to the customer.
That's it.
If you have something that ameliorates a pain point you get the sale.
A hot dog cart at a busy intersection around lunch time wins regardless if there is a better hot dog a few blocks away.
There have been good books on this topic but Harry Browne's 'Secret Of Selling Anything' probably is the most concise and efficient at delivering the information.
However, if you have read anything about Edwin Land, founder of Polaroid, he might have the sales pitch I have ever read.
Edwin recently developed polarized glass. This technology blocks out part of the light wavelength to reduce glare but keeps vision sharp unlike tinted glass that simply everything darker.
To sell this new technology he has a sunglass company come to his western facing high-rise suite around sunset. With the sun blasting through the windows the company comes in squinting to see Edwin. He apologizes for the glare and says 'I bet you can't even see the fish tank by the window the sun is so bright'.
He hands out his new polarized sunglasses and the pain of the glare is instantly removed. He asked the executives 'how many fish do you see now?'
They all answer correctly and got the sale.
It would have been one thing to put them in front of powerpoint slides* and tell them about this new polarized technology but it was a masterclass in demonstrating value to have the sun destroy their retinas and give them the treatment.
Not every sales pitch for your product, or your raise, or getting a date will be that demonstrative but if you think on those lines you will be better off than most.
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* The horrors of powerpoint had not yet existed back in the 1930's when Edwin Land invented polarized glass so a typical presentation would have looked closer to print outs or projections.