Finance textbooks do not generally spend a lot of time on ethics. This 
is because in finance, we generally argue that if the market believes 
that certain behavior is unethical, the company is punished financially,
 which means management is not maximizing the company value. This week, 
Deutsche Bank 
was fined $2.5 billion for its role in fixing LIBOR and Euribor, and Petrobas was forced to 
write-off $5 billion due to the corruption scandal that has entangled the company.