A guaranteed return that someone would accept, rather than taking a chance on a higher, but uncertain, return. If you've ever thought about leaving your job to start your own business, and potentially make more money, but decided to stay and continue drawing a salary instead, then the amount of your salary is your certainty equivalent. You might need to come up with a business idea with a higher potential payoff to be convinced to leave the security of your existing job.
Investments must pay a risk premium to compensate investors for the possibility that they may not get their money back. If an investor has a choice between a