^^ Purchasing art helps the economy in many ways. The artist buys art supplies ... canvas, oils, chalk, and whatever else he needs to create his project. He also pays rent, buys groceries, maybe purchases a new television, new car, clothes, food for his dog/cat/horse, maybe buys flowers, jewelry. And of course, as the article points out, visitors to the art gallery buy not only paintings, but pay for admission, buy guide books, spend money in the gallery restaurant, purchase membership, etc.
Cindy