Deals also exist when the parties have different risk tolerances or time preferences for money. If I sell you my car because I need a down payment for a condo,

Deals also exist when the parties have different risk tolerances or time preferences for money. If I sell you my car because I need a down payment for a condo, that doesn't mean I think the car isn't actually worth what you're paying. If I know it isn't worth what you're paying because evil mechanics swapped all the working parts with bad ones, and I hide that from you, that's fraud.