This statue of Molly Malone is a tribute to street vendors. Maybe you have heard part of this song. I think Burl Ives sang it.
"In Dublin's fair city where the girls are so pretty I first laid my eyes on sweet Molly Malone. She wheeled her wheelbarrow through streets broad and narrow, singing cockles and mussels, alive a live O."
Dubliners call her the "Tart with the Cart"