The shop across the street buys coconuts in bulk and then prepares them to have the tops cut off and sold as beverages to tourists. Street vendors come along to buy the bags and take them to stalls that can be found all over Chiang Mai. Tasty and refreshing, especially if the vendor keeps the coconuts packed in ice so the juice is slightly chilled. It seems the street vendors pay around (US) 65 cents per coconut and then resell them to passersby for $1.30 to $1.50 each. Sit down restaurants and coffee shops are somewhat more expensive. Still, nobody is getting rich from this business.
I am rather fond of the tree which has grown through the corrugated roofing in the center of the photo.