The supposed joke is that she is wearing a dress that has the following message.
The joke is on anyone who thinks they need to wear a mask
Law of Markets
Dedicated to the economics and politics of the free market
The supposed joke is that she is wearing a dress that has the following message.
Law of Markets 
Lifestyles of the rich and fatuous. We’re watching a movie. It has a very sad ending. For the rich and fatuous.