how does the time value of money relate to opportunity cost 
opportunity cost is key to the concept of the time value of money money can grow only if it is invested over time and earns a positive return money that is not invested loses value over time to inflation therefore a sum of money that is expected to be paid in the future no matter how confidently its payment is expected is losing value in the meantime there is an opportunity cost the opportunity to invest and earn to being paid in the future rather than in the present 