I try to avoid the payment of currency, because I don't want to set a precedent where everything requires American dollars. Also, I want the process of photographing someone to be a shared experience, not an event in which I take a photograph and simply move on to the next. There are as many ways to handle this issue as there are people who will read this article. These work well with children and adults both, and you can easily carry them in your camera bag or pocket. If the subject is a vendor, a purchase often serves as a fair trade.
People are generally proud of whatever they're selling.
Offer them a Polaroid image, if you have one with you, or to send them a photograph, and then follow up on that promise. The good will you spread will open doors for many to come, and for you when you return to that location. Capture the details. Detail images can tell stories as well as a cultural landscape. In the magazine world, these images are often called point pictures.