We know that money as a resource is limited but can have multiple uses. So, if I have Rs 1000 and there are 3 alternatives (A,B, C) of 1,000 each and each offers the same 7% why would I be bothered about either A or B or C because all offers the same int. rate and we can choose any 1 of these 3 because all would provide the same int. rate.
If I had 3 opportunities with varying int. rates then it could have been easy to understand that I’m foregoing(let go) of an opportunity that is paying more. Hence, Opportunity cost.
Don’t you think opportunity cost should be the cost of forgoing an opportunity which could give higher interest rates rather than similar ones?
It has been answered previously