At other times, a buyer may willingly pay a premium price, above the generally accepted market value, if his subjective valuation of the property (its "investment value" for him) was higher than the market value. One specific example of this is an owner of a neighboring property who, by combining his own property with the subject property (assemblage), could obtain economies-of-scale and added value (plottage value). Similar situations sometimes happen in corporate finance. For example, this can occur when a merger or acquisition happens at a price which is higher than the value represented by the price of the underlying stock. The usual explanation for these types of mergers and acquisitions is that "the sum is greater than its parts", since full ownership of a company provides full control of it. This is something that purchasers will sometimes pay a high price for. This situation can happen in real estate purchases too.