Walter has found a new friend in Gale and is surprised that a well-trained chemist decided to become a drug producer. The two of them aren’t the most obvious criminals. Gale believes his importance in the process is to help people get a clean product. Addicts will buy drugs without knowing what’s in them (asymmetric information), but at least Gale’s product is pure.
See more: rational model of crime, elasticity of demand, willingness to pay, asymmetric information
The Economics of Breaking Bad 