These street vendors are on the move for most of the day selling their goods and trading for new ones. It's not an easy job, as their baskets look heavy. You have to admire the foot-shuffling technique the women use to walk with a bounce and the stamina required to carry their loads all day.
A common trick is for a vendor to corner a tourist and place the wooden beam on her shoulder and the hat on her head. As you are still trying to figure out what happened, the vendor asks for money for a photo.
More reading: Hanoi under the skin