The concepts of “cost of capital” and “opportunity cost” account for the scenarios you describe. Money has a price. If you want to borrow money, you pay intere

The concepts of “cost of capital” and “opportunity cost” account for the scenarios you describe. Money has a price. If you want to borrow money, you pay interest. If you have uninvested money, you forego interest and suffer inflation. If you have investors’ funds, that has a cost too. The combined costs of your various sources of money are your cost of capital. Investments are only economically profitable if they make more than the cost of capital. It is quite common to earn an accounting profit but suffer an actual economic loss. If you own property you don’t use, then, assuming you aren’t enjoying some offsetting non-pecuniary benefit, you are suffering an economic loss. You would be better off selling that property so that you can reallocate your capital to a productive purpose.