The CUP method is a particularly reliable method where an independent enterprise sells the same product as is sold between two associated enterprises. For example, an independent enterprise sells unbranded Colombian coffee beans of a similar type, quality, and quantity as those sold between two associated enterprises, assuming that the controlled and uncontrolled transactions occur at about the same time, at the same stage in the production/distribution chain, and under similar conditions. If the only available uncontrolled transaction involved unbranded Brazilian coffee beans, it would be appropriate to inquire whether the difference in the coffee beans has a material effect on the price. For example, it could be asked whether the source of coffee beans commands a premium or requires a discount generally in the open market. Such information may be obtainable from commodity markets or may be deduced from dealer prices. If this difference does have a material effect on price, some adjustments would be appropriate. If a reasonably accurate adjustment cannot be made, the reliability of the CUP method would be reduced, and it might be necessary to select another less direct method instead.