However , what can 't totally be discounted is that a closed-end product launches anyway in a tight market like copper or tin , therefore exacerbating short-term price movements by deploying committed capital into a deficit market , thus bringing forward critical shortages by removing inventory or competing for material in a deficit market . ... a physical ETF in copper might exacerbate short-term volatility and perhaps bring forward our forecasted deficit and extremely tight , backwardated market .