I can buy a van and use it to deliver goods. The price of the van is X. Alternatively, I can hire the van, with a monthly price of Y. What does the economics theory tell about the relationship between X and Y? Obviously, X > Y. But how much more? I get the intuition that the relationship it is related to interest rates on loans for vans. But these interest rates depend on the person/company. Also, for some uses the van can produce a lot of money. For others, none.
What determines the relationship between Y and X?
Thank you people!