Commodities such as oil or cotton often represent crucial inputs for downstream firms' final products. As a result, commodity suppliers always have considerable added value vis--vis these downstream buyers. In fact, oil producers' high degree of added value can explain the existence of cartels such as OPEC. Commodities such as oil or cotton often represent crucial inputs for downstream firms' final products. As a result, commodity suppliers always have considerable added value vis--vis these downstream buyers. In fact, oil producers' high degree of added value can explain the existence of cartels such as OPEC. True False Uncertain