You won’t always be able to sell items to people. People won’t buy things they don’t understand, or things they think aren’t worth the price, and sometimes you’ll be selling to people who simply lack the means to acquire it.
But ideas don’t cost money. And the well-planted seed of an idea can make you more in the long run than a hard-earned sell.
Get someone to accept the right idea from you, and their thinking will change. We know that every single action begins with a thought. Sell someone an idea, and you change everything they do.