Monopoly - With a twist

Elizabeth has a chart of distinct projected prices for a property over the next several rounds. She must buy the property in one round and sell it in another, and she must do so at a loss. She wants to minimize her financial loss. For example, the property is valued at price = [20,15,8,2,12] over the next n = 5 rounds. She can purchase the property in any round, but she must resell the property