The seenand the unseen
A shopkeeper has saved $6 for new shoes. His window breaks, and fixing it costs just as much.
If the glass breaks
Worn shoes
The glazier gets $6
If the glass stays intact


New shoes
The shoemaker gets $6
What goes unseen is the shoemaker’s lost sale, and the new shoes the shopkeeper can no longer buy.
Inspired by What Is Seen and What Is Not Seen, by Frédéric Bastiat, 1850