Display. Just as in any retail operation, the way you display your wares will greatly impact your sales. Produce should be placed underneath a cover to protect it from the sun, but be sure to allow at least seven feet of head room. Display your prices prominently, and clearly identify the things that make your product special. Personalize your stand with signs to inform your customers.
Regardless if you need to earn some fast cash or we're just talking about making money in the grand scheme of things, there's an important psychology that needs to be mentioned before getting into the strategies. If you study Freud's model of the mind, you'll discover the Psychic Apparatus. It's the three-part construct in your mind that controls all of your behavior.